Options are:
1). bad smells;
2). kinetic energy;
3). sticky substances;
4). electrically;
5). spinning electrons;
6). heat energy;
7). Electrical energy;
8). object size;

Fact 1: Magnetism can cause objects to repel each other. Fact 2: Aspinning electron is what causes magnetism. Given the two facts above, what causes objects to repel each other?
Answer:
5).