I am told the answer is B? Is this correct?

6. Suppose that the bag class is efficiently implemented with a fixed array with a capacity of 4000, as in Chapter 3 of the class text. We execute these statements: bag b; b.insert (5); b.insert (4); b.insert(6); b.erase_one(5); o A. b.used is 2, b.data[0] is 4, b.data[1] is 6 o B. b.used is 2, b.data[0] is 6, b.data[1] is4 o C. b.used is 3, b.data[0] is 4, b.data[1] is 6 o D. b.used is 3, b.data[0] is 6, b.data[1] is 4