In another section of the community garden, some members raise chickens, not only for their eggs but for the manure to fertilize the avocado trees. Each chicken produces 50 kg of manure per year, and the garden's chicken coop holds 25 chickens. Each avocado tree needs 10 m^2 of space to grow. Calculate the number of avocado trees that the manure from the chicken coop can fertilize.

Options:
a) 10
b) 15
c) 20
d) 25