Correct Option: D. Closes its boundaries with no correction Explanation of the Correct Answer: A chain survey is a method of surveying that involves measuring distances using a chain or tape and marking points on the ground. One of the key advantages of a chain survey is that it can effectively close its boundaries without requiring any corrections. This means that when the survey is completed, the starting point can be connected back to the endpoint, forming a closed loop. If the measurements are accurate, the starting and ending points should coincide, indicating that the survey is complete and reliable. In contrast, a prismatic compass survey, which uses a compass for direction and a tape for distance, may not always close its boundaries perfectly. Errors can occur due to various factors such as magnetic declination, human error in reading the compass, or inaccuracies in distance measurement. When a prismatic compass survey does not close, adjustments or corrections must be made to ensure the accuracy of the survey results. Why Other Options Are Incorrect: A. Yields relatively more accurate results - While chain surveys can be accurate, they are not inherently more accurate than prismatic compass surveys. The accuracy of both methods depends on the skill of the surveyor and the conditions under which the survey is conducted. Therefore, this option is misleading as it suggests a definitive superiority in accuracy that does not universally apply. B. Involves highly more portable equipment - Both chain surveys and prismatic compass surveys use relatively portable equipment. A chain (or tape) and a compass are both lightweight and easy to transport. This option does not provide a clear advantage of one method over the other, as both can be conducted with portable tools. C. Does not require a base map - While it is true that chain surveys can be conducted without a base map, this is also applicable to prismatic compass surveys. Both methods can be used in the field without prior maps, especially in preliminary surveys. Thus, this option does not highlight a unique advantage of chain surveys. Summary of Key Points:

• Chain surveys can close their boundaries without requiring corrections, making them reliable for ensuring that measurements are accurate.
• Prismatic compass surveys may require adjustments if they do not close properly, which can introduce errors.
• Both methods use portable equipment, so portability is not a distinguishing factor.
• Accuracy depends on the surveyor's skill and environmental conditions, not solely on the method used.

This thorough understanding of the advantages and limitations of chain surveys versus prismatic compass surveys will help you in your geography studies and professional exams.