In which sentence does the verb agree with the subject?

a. My friend and her mother laughs at all my jokes.

b. Every soup and salad cost less than five dollars.

c. Each plate and bowl has a spot in the cupboard.

I would say c because it explains has a spot somewhere in the cupboard

In sentence construction, a sentence must naturally have a subject and a predicate. IN the sentences above, the most logical sentence where the verb agrees with the subject is letter B with the sentence: Every soup and salad cost less than five dollars. The subject here is the ‘soup and salad’ while the predicate is ‘cost less than five dollars’. In cases like the sentence A: My friend and her mother laughs at all my jokes. ‘friend and mother’ were supposed to be the subjects however, the verb agreed to another subject at the end of the sentence which is ‘all my jokes’.