The correct answer is C, although I do believe that there should have been a "the" after "In" in that sentence. Sentence B is a run-on, same with sentence D. In sentence A, the comma cuts off the first part of the sentence.
c) In the spring,when the water is high,the lake surged over the rocks.
The correct answer is
C) In spring, when the water is high, the lake surges over the rocks.
This sentence correctly uses the commas to go into more detail about spring.
Hope this helps!
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