I'd say the passage is credible; it gives quotes from a credible person and they're information comes from WHO and the CDC.
The correct answer is: a. Bias is an opinion that favors one point of view.
When a theorist or researcher displays bias in her/her work, he/she favors one point of view, while disregarding other points of view that might be valid and relevant. An example of a bias would be when a scientist claims that caffeine alone increases energy levels, while ignoring the effect of other significant factors, such adequate sleep, carbohydrates, etc., on energy levels. In this instance, the scientists is favoring one point of view, while dismissing other factors that are also relevant to the issue at hand.
