The correct answer is: A. Move
The verb “move” can be used as a noun or a verb. As a noun, it refers to the act of changing one’s location. As a verb, it means to change one’s location or to cause something to change its location.
In the sentence “They can’t help us move the house,” the verb “move” is being used in its transitive sense. This means that it is taking a direct object, which in this case is “the house.” The sentence is asking whether or not someone can help us to change the location of the house.
The other options are not correct because they do not make sense in the context of the sentence. Option B, “moving,” is the present participle of the verb “move.” It would be used to describe the action of moving, not the result of the action. Option C, “moved,” is the past tense of the verb “move.” It would be used to describe an action that has already taken place. Option D, “move to,” is a phrasal verb that means to change one’s residence to a new place. It would not be used in the context of this sentence, which is asking about helping someone to move a house.