选择题
2013 AMC 8 Problem 6: Product Pyramid
The number in each box is the product of the numbers in the two boxes that touch it in the row above. For example, 30=6×5. What is the missing number in the top row?
2013 AMC 8 第6题 ：产品金字塔
每个方框中的数字是上面一行中触摸它的两个方框中的数字的乘积。例如， 30 = 6 × 5。首行缺少的数字是什么？
A.
2
B.
3
C.
4
D.
5
E.
6