Fill in the blank with the most appropriate word. How long will she ________ in London? A. being staying B. stays C. to stay D. stay

The correct answer is “stay”.

“Being staying” is not a grammatically correct phrase. “Stays” is the present tense of the verb “to stay”, but it does not make sense in this context. “To stay” is the infinitive form of the verb, but it also does not make sense in this context.