Q: Fact 1: Vertebrate chordates have a backbone. Fact 2: Because reptiles are vertebrates, they are chordates. Given the two facts above, what has a backbone?

Options are:
[1]. reptiles.
[2]. four limbs.
[3]. humans.
[4]. the Sun.
[5]. bacteria.
[6]. insects.
[7]. sponges.
[8]. elephants.
The answer is:
[1].