All of the options you provided can enhance clarity in teaching someone how to make a peanut butter and jelly sandwich, but if I had to select the most effective approach, it would be:
A. Use signal words to show sequencing.
Using signal words (like "first," "next," "then," and "finally") helps guide the learner through each step in a logical order, making the process easier to follow. However, combining this with elements from options B, C, and D would also improve clarity significantly.