Scenario 13-18 Farmer Jack Is a Watermelon Farmer. If Jack Plants No

Scenario 13-18
Farmer Jack is a watermelon farmer. If Jack plants no seeds on his farm, he gets no harvest. If he plants 1 bag of seeds, he gets 30 watermelons. If he plants 2 bags of seeds, he gets 50 watermelons. If he plants 3 bags of seeds he gets 60 watermelons. A bag of seeds costs $100, and the costs of seeds are his only costs.
-Refer to Scenario 13-18. Farmer Jack's marginal cost
(i) curve is U-shaped.
(ii) decreases with increased watermelon output.
(iii) reflects diminishing marginal product.

A) (ii) only
B) (iii) only
C) (i) and (iii) only
D) (i) and (ii) only