Answer:
B
Step-by-step explanation:
This is secondary innovation- It is a specific innovation process which originated an acquired developed technology , and then modified further modified and developed based on the template of the original technology. It usually common in the developing and middle developed countries as they build on the template and prototypes of the developed country's' technology.
Thus, in this case, the small toy represented the primary innovation, while the two-wheel cart represented the secondary innovation.