In Which of the Following Situations Would a T Test

In which of the following situations would a t test for independent means be conducted?

A) a comparison of the SAT scores of a group of 10 students who completed a special SAT preparation course compared to the scores of students in general on the SAT
B) a comparison of scores of participants in a memory study where one group is assigned to learn the words in alphabetical order and another group is assigned to learn the words in order of length of the word
C) a comparison of participants' scores on a skills test before and after attending a training session intended to improve the skill
D) a comparison of participants' logical reasoning skills with the general population