The grammatically correct sentence is C.) El jugo de la sandía es muy delicioso. In Spanish, the word "el" is used as the definite article for masculine singular nouns, while "la" is used for feminine singular nouns. Since "sandía" is a feminine noun, the correct article to use is "la." Therefore, the correct sentence is "El jugo de la sandía es muy delicioso," which translates to "The watermelon juice is very delicious" in English. Remember to use "de" to indicate possession or origin, as in "de la sandía" meaning "of the watermelon."
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