The BEST response that completes the R.A.C.E strategy for the prompt is:
"A dictionary helps readers better understand familiar words by providing a definition, part of speech, pronunciation, etc. These things help readers to best determine the meaning and relevance of a word."
This response effectively restates the prompt, answers the question by explaining the utility of a dictionary, cites specific features (definition, part of speech, pronunciation), and explains how these features aid in understanding word meanings.