Choice A is the best answer. The pronoun "them" in the second clause ("students enjoy interacting with them") is plural. Therefore, the antecedent in the first clause must be a plural noun. "Virtual reality headsets" provides the correct plural agreement.

Choice B is incorrect because "a virtual reality headset" is singular and does not agree with the plural pronoun "them." Choice C is incorrect because "an electronic simulator" is singular. Choice D is incorrect because "virtual simulation" is singular and uncountable.