当两个共点力F₁与F₂的大小为以下哪组数据时，其合力不可能为5N的是(　 　)

A．F₁＝6N, F₂＝3N

B．F₁＝3N, F₂＝3N

C．F₁＝5N, F₂＝2N

D．F₁＝8N, F₂＝2N

Which of the following statements can be inferred from the graph ？（）
Ⅰ．School X has a smaller enrollment than School Y.
Ⅱ．If the age of a book is the number of years since purchase, then the average (arithmetic mean) age of a book in the School Y inventory is less than that of a book in the School X inventory.
Ⅲ．According to the inventory, School X and School Y purchased the same number of textbooks in 1976.

A．None

B．Ⅰ only

C．Ⅱ only

D．Ⅰ and Ⅱ

E．Ⅱand Ⅲ