Space by giving as much space as possible to the greater of two hazards

Which of the following statements is a claim of definition?

What is the central idea in this advice from branch rickey to jackie robinson?  

Which of the following factors most consistently contributes to the speaker’s believability? a the age and experience of the speaker b the physical environment in which the speech is delivered c the sincerity, knowledge, and trustworthiness of the speaker d the position of the thesis statement in the speech