Question

a writer references a source entitled “can seabiscuit’s dna explain his elite racing ability?” in his paper. which signal phrase best establishes the source’s authority and credibility?steven tammariello, a horse enthusiast who never misses a kentucky derby, writes,steven tammariello, former professor of english at the ohio state university, writes,steven tammariello, associate professor of biological sciences at binghamton university, writes,steven tammariello writes,

Explanation:

To establish a source's authority and credibility, the signal phrase should mention relevant professional credentials. A horse enthusiast (first option) has no academic or scientific expertise related to DNA. A former English professor (second option) has expertise in a field unrelated to DNA. Just stating the name (fourth option) provides no credibility. However, an associate professor of biological sciences (third option) has relevant scientific expertise (biological sciences is related to DNA), which gives authority to discuss a topic like Seabiscuit's DNA and racing ability.

Answer:

Steven Tammariello, associate professor of biological sciences at Binghamton University, writes,