Which One of the Following Represents a Testable Hypothesis That

Which one of the following represents a testable hypothesis that might have been derived from a theory of instruction?

A) Learning by discovery should be the central focus in teaching at the elementary school level.
B) It is the responsibility of teachers to organize material in logical and meaningful segments.
C) Learning and retention increase if the teaching materials are made meaningful for the students.
D) The first step that every teacher should take is to motivate students for learning tasks.