( 50 points!!) Mr. Brown is organizing a camping trip for the students in his scout troop. He has the following breakdown of how much it would cost him per day of the camping trip. Campground rental: $200 per day Training Cost: $20 per student per day Food Cost: $30 per student per day Miscellaneous Expenses: $50 per student per day Camping Gear Cost: $1,050 (one-time cost) Mr. Brown's total cost for organizing a 3-day camping trip with b students is represented by the expression below. Which statement best describes the coefficient of b?
A. It is Mr. Brown's total cost per day for campground rental and the camping gear.
B. It is Mr. Brown's daily cost per student for campground rental and the camping gear. C. It is Mr. Brown's daily cost per student, with training, food, and miscellaneous expenses.
D. It is Mr. Brown's total 3-day cost per student, with training, food, and miscellaneous expenses.