Respuesta :
I believe it's D, because without "(especially the corn)" its a complete sentence that still makes sense.
The sentence in which parentheses are used correctly is D. Uncle Travis’s vegetables (especially the corn) are famous for their flavor.
Parentheses are utilized in order to enclose incidental or extra information, including a passing comment, a minor example or addition, or a brief explanation. The writer may choose to write additional information within parentheses or to set off the text using dashes or commas.