aside from humans, only higher primates, dolphins, killer whales, and elephants are able to recognize them…

aside from humans, only higher primates, dolphins, killer whales, and elephants are able to recognize them in a mirror. choose 1 answer: a no change b itself c himself d themselves
Answer
Brief Explanations:
The subject "higher primates, dolphins, killer whales, and elephants" is plural. The reflexive - pronoun should agree in number with the subject. "Themselves" is the correct plural reflexive - pronoun for third - person plural.
Answer:
D. themselves