Final answer:
The domain of the function C(m) is all whole numbers from 0 to 10.
Step-by-step explanation:
The domain of the function C(m) represents the possible values for the input variable m. In this case, the function C(m) represents the cost of m months of grocery delivery. Since the number of months cannot be negative and there is no maximum limit mentioned, the domain of C(m) is all positive whole numbers.
Therefore, the correct answer is c. all whole numbers from 0 to 10.