Answer:C
Explanation: A,B and D are financially supported by a commercial entity that can benefit from stated views that promote their product (A, D) or make adverse claims against a competitor to their product (B).
Even if the information is factual, the perception of possible bias makes it unreliable without unbiased/disinterested validation.
For C, the National Heart Association, although not disinterested, is a reputable organisation whose concern is with public health, and in this case, the information can be taken as unbiased.