Which of the Following Sentences Is Grammatically Incorrect

Which of the following sentences is grammatically incorrect?

A) Lara touched Saul′s forehead to check if he had a fever.
B) Carlos and Mark went to Mexico together and he had some trouble with the spicy food.
C) Edward′s favorite pie is his mother′s: she always uses fresh fruit from her garden.
D) The major and her assistant always go to that restaurant, you can′t convince them to try another one.