Read the Following: an Assumption Is Something Taken for Granted

Read the following: An assumption is something taken for granted, a supposition. These assumptions are accepted as the truths upon which the discipline is based. Stated another way, a discipline's defining elements-its theories, concepts, and methods-are simply the practical manifestations of its assumptions. Grasping the underlying assumptions of a discipline as a whole provides important clues to the assumptions underlying the writings of its experts on a particular problem […] . (Repko, 2008, p. 89) .
We might deduce from this that

A) Assumptions shape the discipline's theories, concepts, and methods.
B) Assumptions might prove helpful in creating common ground because disciplines may share the same assumptions.
C) None of the statements above is correct.
D) Both of the statements "a" and "b" are correct.