a)have
b)has
c)are
d)is
The correct answer is: b) has
Explanation:
The sentence: Neither the children nor their father _ arrived.
Rule: When neither…nor * is used, the verb agrees with the noun closest to it.
Here, their father is singular (closest to the verb).
So, we use the singular verb: has
Complete sentence:
Neither the children nor their father has arrived.