Of the Many Different Features of the Scientific Method, One

Multiple Choice

Of the many different features of the scientific method, one feature is the most important. Without it, we should not call a field a "science." This feature is

A) the interaction between theory and observation.
B) the use of only those theories that are known, for certain, to be true.
C) the use of mathematics.
D) the use of quantitative measurements.
E) that the results should lead to some useful technological application [for example, a useful medical treatment].