How can a speaker best convince a listener that his or her thoughts are worth considering

Using evidence will best convince a listener

The type of information that indicates something as true is a fact; what is obvious doesn't need to be argued or coaxed, thus the best way to convince someone about something is meet people with facts and let them be enlightened by a factual environment, nay evidence.

Explanation:

the answer to number one is b the answer to number to is a

i think the life is invaluable.

you can also say immeasurable.