Task: Question Answering
Input (English): Question: The weight of every type A widget is the same, the weight of every type B widget is the same, and the weight of every type C widget is the same. If the weight of 7 type A widgets is equal to the weight of 2 type B widgets, and the weight of 4 type B widgets is equal to the weight of 7 type C widgets. What is the ratio of the total weight of 1 type A widget and 1 type B widget, to the total weight of 1 type B widget and 1 type C widget?

 Option A: 3:5

 Option B: 5:7

 Option C: 7:9

 Option D: 9:11

 Option E: 11:13
Output (English): Option D