Credible would be
Someone who's credible is honest and believable. ... Similar to words like reliable and plausible, credible is an adjective that comes to us from the Latin credibilis, meaning “worthy to be believed.” A credible reputation is often earned through consistent good behavior and an overall trustworthy personality.
Answer D.
The king is a tragic hero because he loses everything in the end. The king has a tragic ending.
Answer: B
Explanation: the answer is B because "go" is a action verb