Respuesta :
The concluding sentence which best ties the ideas together and supports the paragraph compare-and-contrast text structure here is However, once the basics are learned, both are fun ways to enjoy the ocean.
In the sentence, it is seen that However is a phrase used for concluding a sentence and the sentence compares two things here.
Concluding sentences
A concluding sentence is the last sentence of a paragraph. It puts in summary the main idea of a paragraph.
Therefore, the correct  answer is option D.
However, once the basics are learned, both ways are fun ways to enjoy the ocean.
Read more about compare and contrast here:
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