I don't know. Reacting to the prompt by explicitly agreeing with it or disagreeing with it seems like a text responsey thing to do to me. I thought the idea of the prompts in context was to use them as a springboard, thus generally I wouldn't think you would actually directly address the prompt in a Context piece unless it made sense to in your given form. Introducing a counterargument to me, which was one of megan's suggestions, seems to involve responding to the prompt directly, one way megan's suggestion might apply is if you were writing a persuasive piece in response to another (fictional) article which had argued the point of view expressed by the prompt, and you wished to argue against the prompt. I just thought this deserved some form of clarification.
This sounds right on the money to me. I will add some of my own thoughts.
In Creating and Presenting you are more or less expected to get into the spirit and main thrust of the prompt.
Loooking for counter-prompts is not the percentage play. For instance, how easy would it be to present a counter-prompt within a Creative piece ? Near enough impossible in the time allowed.
It pays to play it straight. There are practical reasons for this. It allows you to use all your usual tricks. Particularly in expository or persuasive pieces. By the time you do your 'unpacking the prompt' business, you have demonstarted to the assessor that you have COMPREHENDED the meaning of the prompt (tick) and, IMPORTANTLY, you have written the first few hundred words of your essay (tick). This is a big advantage. You only get so much time to write an essay. You dont want to waste too much of it trying to be a hero.