In each of the following sentences, a blank space appears where a verb should be. Select the letter of the correct helping verb and past participle form. Marina's mother ____ her diary more than once.

A) has readed
B) has read
C) have read

The correct helping verb to use is "has" because the sentence is in the present perfect tense, and the past participle of "read" is "read." Therefore, the correct answer is "has read." Option A is incorrect because "read" is already the past participle form - it does not need a "d" added to the end. Option C is incorrect because "have" is not the correct helping verb to use with "Marina's mother" as the subject.