Horace charges $25 to mow a lawn. He needs at least $450 to buy a new lawnmower. Horace wrote the inequality shown below to find m, the number of lawns he can mow to have enough money for the new lawnmower.
25m ≥ 450
What is the solution set for Horace's inequality?
A. m ≥ 18
B. m ≥ 14
C. m ≤ 18
D. m ≤ 14