How can the notion of objection be expressed regarding watching someone paint?

The correct choice effectively expresses the notion of objection in the context of watching someone paint by directly addressing any potential concerns the painter might have regarding the observer's presence. The phrase "Do you have any objection to my watching" explicitly asks if the person painting has any reservations or disapproval about being observed. This phraseology is clear and formal, ensuring that the observer is being respectful of the painter's feelings and autonomy.

In contrast, the other options do not address the concept of objection in the same explicit manner. Asking if someone minds helping, whether it's okay to observe, or if it's alright to critique focuses more on different aspects, such as offering assistance, gaining permission to watch, or implying judgment rather than directly consulting about any objections. Thus, option B stands out as the most direct inquiry into the painter's feelings about being watched, aligning closely with the intent to understand if the observer's presence is welcome or not.