Answer:
d) their
Step-by-step explanation:
in this sentence, “their” is the best choice to use in the sentence; “our” is not the right choice, because it would imply a plural, so the sentence would have to be modified to “our shoes”; neither “he or she” are the right choice, because neither of them are grammatically correct in the sentence, “his or her” do not work in this sentence, because this sentence uses the neutral “their”,so in order to make the sentence work correctly, “no one” would have to be replaced with “he” or “she”, and remembers would have to be replaced with “doesn’t remember”