Context-free languages are closed under:
Union, Kleene closure
Complement, Kleene closure
Cfl are not closed under intersection and complement now choose the correct option so (B)union and klenne closure.
You are welcome
check it out http://cs.stackexchange.com/questions/58255/why-dcfl-is-not-closed-under-kleene-star
The context-free languages are closed under union, concatenation and Kleene closure.
so option B