Which of the following sentences has a subject/verb agreement problem?

a. each of the students is new to online learning
b. the student in the newspaper were changed with theft
c. my dog and my cat are going to the vet
d. tom doesn't go anywhere without jerry

need an answer asap

Let us dissect each sentence to tell which of these does not follow the rules for subject-verb agreement.

A.) The subject is 'each of the students' while the verb is 'is'. More particularly, the verb refers to 'each' which is singular. So, this is correct.

B.) The subject is 'student' while the verb is 'were'. The word 'were' is the paste tense of are which is used for a plural subject. But since student is singular, then the verb should have been 'was'. So, this is incorrect.

C.) The subject is 'my dog and my cat' which pertains to two nouns, thus it is plural. It agrees with its plural verb 'are'.

D.) The subject is 'Tom' while the verb is 'does'. Both are intended for singular use. So, this is correct.

Therefore, the answer to this is letter B.