The club worked hard to build membership. a.) his or her b.) its c.) their

C The club worked hard to build their membership.
                                                                        

The answer is C. their
because it is a collective

is basically a good source of getting and others by what you know for example if someone asked a question and you know the answer you could answer it and get some points or if you need on a question you could make a post about it and wait till someone answers it or just look up the question and see if someone else has asked about it