Answer:
C) Change dipped to dips in Sentence 4.
Step-by-step explanation:
According to the given sentence, there was an inappropriate verb shift from present continuous tense to past tense.
Reading the sentence closely, you'll notice that the verbs used are mostly in the present continuous form. "He WALKS towards the ocean", "The water FEELS cold..." and then you notice that there is a shift from the present continuous tense to past tense in Sentence 4 when the author said, "Then he slowly DIPPED" his feet... "
Therefore, the revision that fixes the inappropriate shift in tense in the paragraph is to change dipped to dips in Sentence 4.