Kelly hypothesizes that if she waters a fig tree seedling, it will grow twice as fast as an unwatered seedling. Which of the following steps would compromise her experiment?
1. Plant two fig tree seedlings of the same age
2. Water one of the seedlings three times a week
3. Apply fertilizer to the other seedling three times a week
4. Measure the seedlings growth weekly
5. Report her results
A Step 1
B Step 2
C Step 3
D Step 4