The correct answers are A) attending subcommittee meetings and B) drafting legislation and submitting it to your Congressional representative.
The other options of the question were C) reviewing the bill once it's been drafted. D) talking to other members of the House to encourage them to vote for it. E) watching the debate from the galley.
If you were successful in getting a law passed, you personally could be involved by attending subcommittee meetings and drafting legislation and submitting it to your Congressional representative.
That is what citizen's participation in politics is all about. It is not only to cast your vote during elections but to actively participate in your community issues and be in contact with your representatives. You voted for them, you put them in power and you have the right to demand results and the resolution of problems.