Which of the Following Sentences Uses an Incorrect Idiom

Which of the following sentences uses an incorrect idiom?

A) He knew the names of all his employees from heart.
B) It's hard to believe that we lost our jobs.
C) She built this company from scratch.
D) The salesperson made the deal more enticing by offering a huge discount.
E) When I bought my car, the dealer offered free auto maintenance for a year.