The correct answer is: C. more
The word “more” is the only option that makes sense in the context of the sentence. The sentence is about how many workers are needed for a construction project. The word “more” indicates that the number of workers needed is greater than the number of workers who are currently working on the project.
The word “little” does not make sense in the context of the sentence. The word “little” indicates that the number of workers needed is small. However, the sentence is about how many workers are needed for a construction project, which is a large project that requires a large number of workers.
The word “either” does not make sense in the context of the sentence. The word “either” indicates that there are two possible options, but the sentence does not provide any information about two possible options.
The word “some” does not make sense in the context of the sentence. The word “some” indicates that the number of workers needed is unknown. However, the sentence is about how many workers are needed for a construction project, which is a large project that requires a large number of workers.