I would say it could be a and b of but probably. A.
Answer:
The growth had different number of sources. The automobile industry was partially responsible, as the number of automobiles produced almost quadrupled between 1946 and 1955. A housing boom, stimulated in part by easily affordable mortgages for returning servicemen, which fueled the expansion.
Explanation:
1. B
2. B
3. A
4. B
5. A
6. B
7. B
8. A
9. A
10. A