Mark and Ann together were allocated n boxes of cookies to sell for a club project. Mark sold 7 boxes less than n and Ann sold 2 boxes less than n. If Mark and Ann have each sold at least one box of cookies, but together they have sold less than n boxes, what is the value of n? Pick:
A) 4 B) 5 C) 6 D) 7 E) 8

Rationale: "if n = 8 mark sold 1 box and ann sold 6 boxes total 7 < 8 answer : e"
Answer: E