Here's a problem to solve: Why is the structure of a sperm cell very different from the structure of an egg cell?

Among the 4 following options, which is the correct answer?

- A: A sperm cell must move in order to reach the egg cell.
 
- B: An egg cell must divide into many separate sperm cells.
 
- C: An egg cell must move in order to reach the sperm cell.
 
- D: A sperm cell must combine with many different egg cells.
 