I go with option a as well with c because there is no any problem of repeating the question we can change it by the way he question like example he has asked question like this let's have a party today
And you asked can we have a party today both have similiar meaning the only difference we see is that the way of speaking is only different .

We can merged the question and answer and make a new question from that so we can make varities of question which were asked previously so it is very happy for everyone to have their own question from the previous repeated question it should be not same question you can post instead of that the speaking language sholud be different and also it has same meaning which was asked before.

By viewing the answer and from that only we can merged the idea in small sentence and make them in to question then we can have a good question from it also.so ,I definitely goes with both a and c question.