Sam is conducting a science experiment about the effects of fertilizer on the growth of a plant. In week 1, his plant grew 12.26 centimeters. In week 2, his plant grew 7 centimeters. In week 3, his plant grew 5.79 centimeters.
What was the total growth of his plant during the 3 weeks?
A. 18.12 centimeters
B. 24.65 centimeters
C. 24.95 centimeters
D. 25.05 centimeters