Task: Question Answering
Input (English): A student conducts an experiment to determine the average size of acorn that squirrels eat. The student gave several different sizes of acorns to a squirrel. Which action would most likely improve the results?  
 (A) change the food source (B) use more than one squirrel (C) increase the number of students (D) shorten the period of observation
Output (English): B