Final answer:
The qualifications of the writers of the report contribute to the credibility of the report as a source on the topic of the proposed subway system.
Step-by-step explanation:
The factor that will contribute to the credibility of the report as a source on the topic of the proposed subway system is A) Qualifications of the writers of the report. The qualifications of the writers play a crucial role in determining the expertise and credibility of the report. A report written by individuals with relevant qualifications and experience in urban planning or transportation would be more reliable and trustworthy. Length of the report (option B), cost of the report to the city (option C), and the number of tables and charts in the report (option D) do not directly relate to the credibility of the information presented in the report.
A city is considering the construction of a subway system, and a report has been generated to analyze proposed subway plans. The factor that will contribute to the credibility of the report as a source on the topic is A) Qualifications of the writers of the report. The qualifications indicate the level of expertise and specific knowledge the authors have in the subject area, which directly affects the report's reliability. Neither the length of the report, the cost of the report to the city, nor the number of tables and charts inherently contributes to the credibility; these factors are secondary to the authority and expertise demonstrated by the qualifications of the writers.