What aspect of this persuasive speech helps make the speaker seem reliable or trustworthy?

Responses
A The speaker has a degree is recycling and sustainability practices.The speaker has a degree is recycling and sustainability practices.
B The speaker lives in a home that is made of 90% recycled materials.The speaker lives in a home that is made of 90% recycled materials.
C The speaker thoughtfully presents all the reasons for a recycling program in a logical way.The speaker thoughtfully presents all the reasons for a recycling program in a logical way.
D The speaker owns a company that is going to make the recycling program cheaper for the schools.

C The speaker thoughtfully presents all the reasons for a recycling program in a logical way.

D The speaker owns a company that is going to make the recycling program cheaper for the schools.