How can we rephrase the idea of capturing someone's attention to prevent revealing a secret?

The chosen rephrasing effectively conveys the idea that seizing Brian's attention was crucial in preventing him from disclosing a secret. The use of “Had I not caught Brian's eye” emphasizes the need for attention to keep the secret safe. This structure implies a counterfactual scenario, suggesting that if the speaker had not successfully engaged Brian, the negative outcome of revealing the secret would have occurred.

The other options do not capture this cause-and-effect relationship as clearly. They either do not use the language of prevention as effectively or alter the meaning in a way that suggests the outcome was not contingent solely on capturing attention. The selected choice best illustrates the importance of attention in safeguarding the secret, making it the most suitable transformation of the original idea.