Why did the british want to expand control into the ohio river valley in the mid 1700s

The choices can be found elsewhere and as follows:

A. To force the french out of North America 
B. To put French settlers there under English rule 
C. To demonstrate Britain's strength to France and Spain
D. To gain access to the regions natural resources 

I think the correct answer is option A. The British want to expand control into the ohio river valley in the mid 1700s in order to force the french out of North America.