Final answer:
In teaching echoics, we shape by reinforcing word approximations before requiring correct words. The answer is C. both a and b.
Step-by-step explanation:
In teaching echoics, we shape by reinforcing word approximations before requiring correct words.
By using word approximations, we are allowing students to gradually get closer to the correct words by reinforcing their attempts. This shaping technique helps students develop their echoic skills and make progress towards accurate verbal responses.
Therefore, the answer is:
C. both a and b