Answer:
The resource Oliver should use is:
B. a scientific study published in a consumer magazine; chicken was prepared in both ways and then tested for strains of bacteria.
Step-by-step explanation:
Why?
Oliver wants to know what is safer. Therefore, he should focus on resources that have criteria and proper means for testing safety when it comes to food. Option B concerns a scientific study that is bound to follow rules and procedures. That is the best option.
In option A, the blogger may be a very good cook, but that does not necessarily mean she knows and does everything in the safest possible way. In option C we have a similar situation. Nobody has ever gotten sick from grandma's chicken, but that may be a matter of luck or coincidence. Option D says food safety standards never change, which is not true. A long time ago, for instance, people did not understand the importance of washing vegetables as we do today. All these options can be eliminated.