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. Calculate the mass of the manure produced per year by the chicken coop.

Options:
a) 1,250 kg
b) 1,500 kg
c) 1,750 kg
d) 2,000 kg