When singular and plural subjects are joined by or or nor, the verb

a. must agree with the subject that comes first

b. must always be singular

c. must agree with the subject closer to the verb

d. must always be plural

C. must agree with the subject closer to the verb

Explanation:

When a singular subject is connected by or or nor to a plural subject, put the  plural subject last and use a plural verb.

Example:

The serving bowl or the plates go on that shelf.

If you put the singular subject last, use a singular verb.

Example:

The girls or their father collects the newspapers every morning.

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