Which pairs of variables most likely have a positive association?

choose exactly two answers that are correct.

a. the amount of safety training a group receives and the number of accidents a group has

b. the number of children in a home and a number of toys in a house.

c. the amount of time spent per day playing video games and the amount of time spent per day reading.

d. the number of questions on a test answered correctly and the score earned on that test.