Which sentence best shows correct comma usage? a. the beach was full of, happy carefree tourists. b. the beach was full of happy, carefree tourists. c. the beach was full of happy, carefree, tourists. d. the beach, was full of, happy carefree tourists.

The answer is indeed letter B. The beach was full of happy, carefree tourists.

Explanation:

One of the many uses of commas is to separate coordinate adjectives. Coordinate adjectives are words that come in a row and modify the same noun. In the sentence we are analyzing here, both "happy" and "carefree" are modifying the noun "tourists". Therefore, we must separate the adjectives with a comma - or use "and" between them, which is not the case here. Option B is, thus, the right one.

Option A brings a comma after the preposition "of", separating it from its object, which makes it incorrect.

Options C brings a comma after the second adjective, separating it from the noun it modifies. That also makes it an incorrect option.

Finally, option D brings a comma separating the subject and its verb, as well as a comma separating the preposition and its object. Again, it's an incorrect option.

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