James is asked about what is the best way to study for an exam. He responds that the best way to study is by making flashcards. He easily thinks of all the times he used flashcards and he made A's. However, he fails to take into consideration all the times he made A's and did not use flashcards and the times he used flashcards and did not do well.
His faulty thinking is an example of:

a. Oversimplification bias.
b. Availability heuristic.
c. Present/present bias.
d. Asking biased questions.
e. Cherry-picking evidence.