Q: Fact 1: An animal needs to attract a mate to reproduce. Fact 2: Mammals are animals which raise their young on milk and typically give birth to live young. Given the two facts above, what needs to attract a mate in order to give birth to live young?

OPTIONS:
1). humans.
2). Jellyfish.
3). mammals.
4). Frogs.
5). birds.
6). hormones.
7). insects.
8). reptiles.
The answer is:
3).