OG详解-OG8 文法 Q2

Choice B is the best answer. The convention being tested is the use of non-finite (untensed) verb forms in a sentence. The modal “would,” which indicates the future from a perspective in the past, should be accompanied by a non-finite plain form verb. In this choice, the non-finite plain form verb “create” is used correctly in conjunction with the non-finite plain form verb “increase” to describe what the lock would do. 
Choice A is incorrect because the finite present tense verb “creates” can’t be used in this way with the modal “would” to describe what the lock would do. Choice C is incorrect because the present participle “creating” can’t be used in this way with the modal “would” to describe what the lock would do. Choice D is incorrect because the finite past tense verb “created” can’t be used in this way with the modal “would” to describe what the lock would do.