Question: A student conducts an experiment to determine the effect soap has on the growth of radish seeds. He puts 30 seeds in three different dishes: one with water, one with a 1% soap solution, and one with a 10% soap solution. Which type of data should he collect?

  Options: 
 A. size of seeds and amount of solution used
 B. time of day and number of seeds germinated
 C. type of detergent and amount of solution used
 D. number of seeds germinated and average length of shoot
Answer: B