Task: Question Answering
Input (English): Question: At 1:00 pm, there were 10 grams of bacteria. The bacteria increased to x grams at 4:00 pm, and 22.5 grams at 7:00 pm. If the amount of bacteria present increased by the same fraction during each of the 3-hour periods, how many grams of bacteria were present at 4:00 pm?

 Option A: 14.4

 Option B: 14.7

 Option C: 15.0

 Option D: 15.3

 Option E: 15.6
Output (English): Option C