Was is not an action, so it's a linking verb.
Which book is this? :P lol
Look up fact on duckster.com its a kid sight but it helps me out alot
The sentence that best explains the effect of the metaphor '<span>But a bird that stalks down his narrow cage can seldom see through his bars of rage' would be letter d. The metaphor explains that the bird that is trapped may be consumed by its own anger.</span>
It is common and correct to say that the moral message in the Pardoner's allegory is that money brings all evil.
Anyway, it is important to perceive the discrepancy between what Pardoner says and his behaviour. A Pardoner is a person who offers indulgences. Indulgences were the way to obtain forgiveness for sins and the direct ticket to enter heaven in exchange of a monetary contribution for the Church. Pardoners were supposed to be offering help, spiritual help in this case, but actually pardoners were taking profit of poor peasants and pilgrims.
The Pardoner told the pilgrims a tale about the miseries that money greed brings, and right after he tried to sell relics as indulgences. So actually, the moral message in the allegory is double, because this situation exemplifies how those who praise morality should be watched over carefully.