The field of education is permeated by conflicts and misconceptions because of the

Education is full of conflicts and misconceptions because many of its problems are not amenable to rigorous scientific investigation.

Subjectivity of interpretation (A) is one aspect but is itself a consequence of this difficulty.

Lack of good teaching methods (C) is a narrow, practical issue, not the root cause of conceptual conflict.

All of the above (D) is wrong because the other options are not the primary cause.

Human behaviour and values in education resist controlled, replicable measurement.

Education draws on many disciplines, making single, definitive scientific answers hard to reach.