Beau has a 30-mile commute for work each day. He drives at least an additional 225 miles every month. He needs an inequality to relate his monthly mileage, y, to the number of days he commutes, x. Which answer choice correctly describes this scenario?

A His monthly mileage is greater than the difference between 30 times the number of days and 200.

B His monthly mileage is less than the difference between 30 times the number of days and 200.

C His monthly mileage is greater than or equal to the sum of 30 times the number of days and 200.

D His monthly mileage is less than or equal to the sum of 30 times the number of days and 200.