The right answer for the question that is being asked and shown above is that: "b. precision matching principle" The principle to get a good experimental design is known as a precision matching principle.
The answer is professional online classroom and academic
B. Fulton's Steam Engine
Explanation:
I believe it is B because there were steamboats and steam powered trains as a result.
Oh that looks hard word of advice: read closely and look at whatever reading you have and highlight possible answers don’t rush through it