The correct translation from English to Spanish for "What is today's date?" is:
C. ¿Cuál es la fecha de hoy?
This option uses the correct phrasing and structure in Spanish to inquire about today's date. In Spanish, it is common to use "Cuál es" (which translates to "What is") when asking for specific information like a date. The word "fecha" means "date" in Spanish, so the full question translates to "What is the date of today?" or more naturally, "What is today's date?"
