What may happen if the clean brush is too wet while lifting pooled paint from a wash?

Correct answer: The brush may add water and create another bloom

The governing concept is moisture control during lifting in watercolour. A lifting brush should be clean and only slightly damp so it can absorb excess pigment without releasing much water. If it is too wet, it adds water to the still-active wash, spreading pigment outward and possibly creating a new bloom or cauliflower mark. Thus B is correct; the other choices contradict how water and transparent pigment behave.