I thought "apa" means "what"?
It does, but it can also be used to form yes/no questions.
It is used to form questions in general. Nothing to do with yes no.
Other forms of questions use question words.
Kita is used as an exclusive we (ie. when talking to someone about doing something with someone else "We went to the park today, what did you do?"). This sentence sounds like an inclusive questions, so should be Kami not Kita
"Kita" is inclusive. "Kami" is exclusive.
Can ee use apakah here also? As this is a closed end question..i.e answer yes/no?