The shift of the frontier from A to B was most likely caused
The shift of the frontier from A to B was most likely caused by which of the following?
![](https://img.yulucn.com/upload/1/3d/13dab2242420e82f187bf4d7c628a686_thumb.jpg)
A. technological improvement in the production of batteries
B. more labour available in the economy
C. a general technological breakthrough
D. more capital available in the economy