Choose the option that corrects the error in the underlined portion. If no error exists, choose "No change is necessary."

When the body needs to fight infectious diseases it increases the number of white blood cells.

a)

diseases, it

b)

diseases. It

c)

diseases; it

d)

No change is necessary.
D

I believe its "A"

What is underlined?

D is incorrect.

A is correct.

No change is necessary.

The underlined portion of the sentence is "diseases it". The error in this portion is the absence of punctuation. A comma or semi-colon is needed to separate the two independent clauses "diseases" and "it".

So, to correct the error, we need to add punctuation.

Option C) "diseases; it" is the correct answer as it correctly uses a semi-colon to separate the two independent clauses.