The correct plural form of "una cena popular" is:
c. una cenas populares
However, note that it should actually be "unas cenas populares" to be grammatically correct. "Una" means "one" (singular), while "unas" means "some" (plural).
a. una cenas popular
b. una cenas popularas
c. una cenas populares
d. una cena populares
The correct plural form of "una cena popular" is:
c. una cenas populares
However, note that it should actually be "unas cenas populares" to be grammatically correct. "Una" means "one" (singular), while "unas" means "some" (plural).