Scenario 13-7 Farmer Jack Is a Watermelon Farmer.If Jack Plants No Seeds

Scenario 13-7
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 13-7.Farmer Jack's production function will

A) decrease at a decreasing rate.
B) decrease at an increasing rate.
C) increase at a decreasing rate.
D) increase at an increasing rate.