Arrange the following five events in an order that explains the mass flow of materials in the phloem.
- Water diffuses into the sieve tubes.
- Leaf cells produce sugar by photosynthesis.
- Solutes are actively transported into sieve tubes.
- Sugar is transported from cell to cell in the leaf.
- Sugar moves down the stem.
A2, 1, 4, 3, 5
B1, 2, 3, 4, 5
C2, 4, 3, 1, 5
D4, 2, 1, 3, 5
E2, 4, 1, 3, 5
A2, 1, 4, 3, 5
B1, 2, 3, 4, 5
C2, 4, 3, 1, 5
D4, 2, 1, 3, 5
E2, 4, 1, 3, 5