Suppose That a Consumer Considers Coffee and Tea to Be

Suppose that a consumer considers coffee and tea to be perfect substitutes, but he requires two cups of tea to give up one cup of coffee. This consumer's budget constraint can be written as 3C + T = 10. What should the consumer buy?

A) 2 cups of tea and no coffee.
B) 10 cups of tea and no coffee
C) 3 cups of coffee and no tea.
D) 4 cups of coffee and no tea.