Which of the following sentence(s) is (are) wrong?

Which of the following sentence(s) is (are) wrong?
Which of the following sentence(s) is (are) wrong?
1)Two months has passed already.
2)A lot of new buildings will build in our city soon.
3)Several hundreds of wild animals were killed each day in the old days.
4)Don’t you know what to do next?
A.Only sentence (2) is wrong.B.Sentences (2) and (3) are wrong.
C.Only sentence (3) is wrong D.Sentence (1) and (4) are wrong