In the sentence identify the segment which contains the grammatical error.
If a few drops of lemon are put in the milk, it has turned sour.

Options

A. drops of lemon
B. If a few
C. it has turned sour
D. are put in the milk

Answer

C

Explanation

The given sentence is a type of zero conditional sentence that expresses a general truth or universal facts like If heat is added, ice melts into liquid water. However, this type of sentence should be written in the simple present tense. Hence, .it turns sour. will be answer.