it is not the tools a scientist uses but how he uses the tools t

it is not the tools a scientist uses but how he uses the tools t
A make him a scientis
B make him to be a scientis
C makes him to be a scientis
D make him a scientis
为什么选D而不是B?
it is not the tools a scientist uses but how he uses the tools that___.
A made him a scientist
B make him to be a scientist
C makes him to be a scientist
D make him a scientist