What,if Any,do Most Modern Economists Believe Is the Single Most

What,if any,do most modern economists believe is the single most important factor that can be used to explain economic growth?

A) Nearly all economists agree that there is more than a single factor, but that capital formation is the most important factor.
B) Nearly all economists believe that extensive private property rights are the most important factor.
C) Nearly all economists believe that economic growth is a complex process without a single dominant factor.
D) Nearly all economists agree that abundant resources are the most important factor.