Respuesta :
The answer is A because if you want a reliable source of scientific information you should go to an actual scientist at a scientific conference.
The correct answer is option A- A scientific presentation of experimental results at a scientific conference.
Reason: A scientific presentation contains all the information which is based on experimentation and research of years and years. All the information is a scientific presentation would be factual and contain authentic data.
On the other hand, the other entire options even if contain information would not be authentic and contain errors and words of mouth.