A student has made a plan for research.  Read the plan and the directions that follow.

Research Report Plan
Topic: Bengal tigers
Audience: eighth grade science class
Purpose: to inform
Research Question: What has caused the Bengal tiger to become endangered?

Select the credible, or trustworthy, source that will most likely provide the information needed to answer the research question.

A. 
a dictionary that contains an entry for "tiger"

B. 
a complete printed list describing all the thriving species that live in the same habitat as the Bengal tiger

C. 
a research report completed by a high school student on Bengal tigers several years ago

D. 
a comprehensive listing published by a national scientific organization that describes each animal marked as endangered that explains which animals are endangered and why

D. a comprehensive listing published by a national scientific organization that describes each animal marked as endangered that explains which animals are endangered and why