Farmer Fanny Sells Her Crops in a Perfectly Competitive Market

Farmer Fanny sells her crops in a perfectly competitive market.If she produces 500 bushels for total revenue of $2, 500 and if harvesting the 501st bushel would raise her total cost from $2, 500 to $2, 505, her

A) revenue will increase by $10 if she harvests the 501st bushel
B) revenue will fall by $5 if she harvests the 501st bushel
C) average fixed cost will rise if she harvests the 501st bushel
D) profit will fall by $10 if she harvests the 501st bushel
E) profit will remain unchanged if she harvests the 501st bushel