Here's a problem to solve: Mara planted six pots of lettuce seeds. She placed three pots in a sunny area and three pots in a shaded area. She watered each pot the same and measured the growth of the lettuce. After Mara analyzes her data, what conclusion will it help her to make?

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

- A: When to plant her lettuce
 
- B: Where to plant her lettuce
 
- C: How much water to give lettuce
 
- D: How many lettuce plants to grow
 