Answer:
The statement that uses an idiom is A. The problem with Ben is that he wears his heart on his sleeve.
Step-by-step explanation:
An idiom is an expression that has a particular meaning that is not predictable from the usual meaning of the constituent words, so they are not meant to be taken literally. To wear one's heart on one's sleeve, for example, means to openly show one's feelings, rather than keep them private.