Why would buying an early metal detectors have been disappointing?

The main reason why buying an early metal detector would have been disappointing is because these detectors did not work very well. The first detectors were meant to help miners. However, they did not help much, as they were big, they were expensive and they used a lot of power, while not doing a very good job. However, metal detectors are much lighter, efficient, and cheaper nowadays.

the answer is d. she became an english professor at university of georgia.

the answer should be a)directions.