Answer:
initial
Step-by-step explanation:
A person has three types of credibility
Initial
Derived
Terminal
The credibility of a person before he/she starts delivering their speech is called initial credibility.
The credibility a person has while he/she is giving their speech.
After the speech has been completed the impression the person the audience has is the terminal credibility.
Hence, the case here enhanced Mr. Clark’s initial credibility.