Context: The passage below describes an experiment. Read the passage and then follow the instructions below.

Janelle planted 20 radish plants in a greenhouse, putting each plant in its own pot. She placed ten of the pots under bright light and the other ten pots under dim light. Janelle watered all the plants twice a day. After two months, she pulled the radish plants from the ground, threw away the leafy green tops, and measured the sizes of the radishes. She compared the sizes of the radishes grown under bright light to the sizes of the radishes grown under dim light.
Figure: a radish plant in soil.
Identify the question that Janelle's experiment can best answer.
A. Do radish plants grown under bright light have more leaves than radish plants grown under dim light?
B. Do radishes grown under bright light get bigger than radishes grown under dim light?
From the given choices, choose the correct answer and respond with the letter of that choice.
Answer: B