Which sentence has the correct subject-verb agreement?

a. a city or vacation spot located near the ocean is in danger of a tidal wave.

b. a city or vacation spot located near the ocean are in danger of a tidal wave.

The correct option is A. A city or vacation spot located near the ocean is in danger of a tidal wave.

The subject of the sentence is compound. That means that it has two noun phrases that are joined. In this case, the two noun phrases are joined by "or" which gives a sense of choice between one thing or the other. Moreover, each noun phrase in the subject are in singular form. As a result, the verb should be in its singular form as well.

  yr egu tgeug rgthrgeruyggry   ygueu

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.