Explanation
Correct answer: B.
Choice B is the best answer. The conventions being tested are the use of plural and possessive nouns. The plural noun "variables" correctly indicates that there are multiple variables, and the plural possessive noun "objects’" correctly indicates that the movement of objects in general is being discussed.
Why the other choices are wrong
Choice A
Choice A is incorrect because the context requires the plural noun "variables," not the singular possessive noun "variable’s."
Choice C
Choice C is incorrect because the context requires the plural possessive noun "objects’," not the singular possessive noun "object’s."
Choice D
Choice D is incorrect because the context requires the plural possessive noun "objects’," not the plural noun "objects."
Student discussion
marcosat 0 likes
what? can someone explain what the explanation means with "the context requires plural"? from where???