Answer:
B). Check to see if the authors work as industry-wide consultants or as contractors for specific vendors.
Explanation:
The judgment of the level to which the authors are objective could be determined by 'checking if the authors function as industry-wide consultants or as contractors for specific vendors' as this would assist in deducing that if the authors are offering a factual matter that is based on a universal approach or in influence of specific vendors who might have shaped the author's opinion or preferences. It is essential to check the objectivity(or unbiased approach) of the source as it may influence the credibility of your report and ultimately its efficacy. Thus, option B is the correct answer.