According to this PPF

a. b. resources are equally productive in all activities. a combination of 3 hockey sticks and 9 maple leaves is attainable.

c. a combination of 3 hockey sticks and 9 maple leaves would not employ all resources.

d. the opportunity cost of producing hockey sticks increases as more hockey sticks are produced.

e. the opportunity cost of producing hockey sticks decreases as more hockey sticks are produced