Which of the following exemplifies a sabotaging social influence on a weight loss client?

A spouse that brings home pastries every week represents a sabotaging social influence on a weight loss client because it directly undermines the client's dietary goals. Such behavior creates an environment that is not supportive of the client's intent to lose weight. If the client is trying to avoid high-calorie treats like pastries, the regular presence of these temptations can make it significantly more challenging to stick to their weight loss plan.

In contrast, the other options involve supportive or positive influences. For instance, a co-worker who works out with you during lunch encourages a healthy behavior by providing companionship and accountability. Walking the dog daily with a spouse promotes physical activity and can foster a healthy lifestyle in a positive context. A text message from a friend that encourages progress can boost motivation and reinforce the client's commitment to their goals. These behaviors contribute to a supportive social environment, contrasting sharply with the undermining influence of the spouse who brings home pastries.