Available choices:
1). Something made by Apple.
2). Something made by Cadillac.
3). animal transport.
4). Something made by DuPont.
5). some invertebrates.
6). Riding a bike.
7). transportation technology.
8). Something made by Dow.
Given those answer options, answer the question: Fact 1: An automobile engine transforms chemical energy into mechanical energy. Fact 2: One classic example is the 4.1L Cadillac engine. Given the two facts above, what converts chemical energy into mechanical energy?
A:
2).