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Gregory sees<span> two </span>Montague servants<span> approaching, and discusses with </span>Sampson<span>the best way to provoke them into a fight without breaking the law. </span>Sampson<span> bites his thumb at the </span>Montagues<span>—a highly insulting gesture.</span>
I believe the answer is D (However) because C (Therefore) would not make sense as it means ‘for that reason’ or ‘consequently’, B (Then) is a time connective so that would not make sense as a transition word to connect the paragraph, and A (now) could be referred to as informal depending on how you use it, and it is commonly used as an adverb of time.
I hope this helped
