C. predestination, because it was foretold
The speaker wanted the bard to stop singing because
<span>He was tired of sitting and wanted to participate in the games.
You can read these in the lines
"you've had our fill or food well shared and the lyre too"
and
"test ourselves in contests"</span><span />
A because your heart doesn’t actually sink, it’s an expression of dread. :)