One Drawback of the Test-Retest Method Is

One drawback of the test-retest method is:
Respondents can learn from their first experience taking a survey and utilize the time between the

A) first and second surveys to think about their answer
B) there may still be better indicators to measure a concept despite having face validity
C) having multiple indicators means an individual indicator cannot be assessed for validity
D) having multiple indicators means an individual indicator cannot be assessed for reliability