Task: Question Answering
Input (English): A student wants to determine the effect of garlic on the growth of a fungus species. Several samples of fungus cultures are grown in the same amount of agar and light. Each sample is given a different amount of garlic. What is the independent variable in this investigation?  
 (A) amount of agar (B) amount of light (C) amount of garlic (D) amount of growth
Output (English): C