Use the graph to answer the question that follows. Oliver is catering a dinner party for more than 22 guests. Each guest has a choice between a vegetarian dinner or a steak dinner, The vegetarian dinner is $20 per plate and the steak dinner is $30 per plate. Oliver can spend no more than $610 on the entire party. If Oliver wants to purchase the most amount of food and still stay within budget, which combination of vegetarian and steak dinners is optimal?
A. (26, 3)
B. (29, 1)
C. (20, 7)
D. (23, 5)