The correct option is A it / one
Since the reference is to an inanimate object, third person singular pronoun in neuter sense, "it" must be used. We can use one instead of a noun when it is clear what type of thing or person you are referring to and you are describing them or giving more information about them, like a lab in college. Hence, Option A is correct. The rest of the options do not adhere to this rule, hence incorrect.