Which of the following are characteristics of arthropods?
1. protostome development
2. bilateral symmetry
3. a pseudocoelom
4. three embryonic germ layers
5. a closed circulatory system
A) 1 and 2
B) 2 and 3
C) 1, 2, and 4
D) 2, 3, and 5
E) 3, 4, and 5