Here's how I would approach lobbying in the run up to the meeting, which should be at 10am on Tuesday 30 August.
1 - This week - emails to your ward councillors supporting the scheme, making special mention of your support for Option A.
2 - Friday-Monday - emails to Transport and Environment Committee members.
3 - Monday night/Tuesday morning - social media firestorm of support for the scheme/option A
4 - Tuesday morning - "ride the route", a peleton of commuters rides the full east/west cycle route in the morning rush hour - documenting the current problems on Twitter/Facebook as they ride and how the scheme would solve these. Invite journalists to attend - no problem if they don't, they should pick up the social media feeds as it will be pretty photogenic.
I would keep emails nice and short, you can link to Hanchief's excellent website and blog for detail. What councillors need to hear is why you think it is a good idea, and most importantly that you and (if you have one) your family will use it.
Paper letters would certainly be more memorable than emails, as almost no-one writes them anymore. However, it's a pretty minor detail and well written emails are effective. If you can actually speak to a Councillor in the next week then that is the best way of getting the message across.
Oh, and just in case I didn't make this clear. Option A - if everyone said something like "It's a no-brainer, the best way to ensure the success of the scheme" that would be great. A consistent message that it is the best, in fact the only sensible, option is required - as this is the real issue of contention.
I would make no mention of the opposition - simply ignore them. Mentioning them could be taken as showing we consider their ideas worthy of consideration - they aren't. Better to make a positive case for the scheme being presented at the meeting - remember we are reinforcing what the officials want the councillors to agree.