CELPIP writing task 2 is called Responding to Survey Questions. You are shown a short survey: a realistic situation (a parent council has raised $30,000, a town council is deciding what to do with an empty warehouse, an employer has a benefits budget) and two clearly labelled options, A and B. You choose one, and you explain why, in about 150 to 200 words, in roughly 26 minutes. It is the second of the two writing tasks, one minute shorter than the email.
The single most important fact about Task 2 is what it is not. It is not an email. There is no greeting, no "Dear Parent Council", no sign-off and no signature. Every year an enormous number of candidates arrive at Task 2 straight from writing an email in Task 1, run on autopilot, and type "Dear Organizers" at the top. That single line tells a rater you have misunderstood the task before they have read one word of your argument, and it comes directly out of your Task Fulfilment mark.
The second most important fact is that there is no correct option. Neither answer is right. Raters are not scoring your opinion, they are scoring how well you develop it, which means you should pick whichever option you can supply the best example for, not the one you imagine the marker prefers. Look at the samples below: two of the five deliberately defend the less popular side and win, because a well argued unpopular choice demonstrates far more control than a lazy agreement with the obvious answer.
What Task 2 rewards, in the plainest possible terms, is a choice stated immediately, two or three reasons that are genuinely developed rather than listed, at least one specific example, and honest treatment of the option you turned down. What it punishes is sitting on the fence. Saying "both options are good", refusing to choose, or switching sides in paragraph three costs you marks no matter how elegant the sentences are.