I think it's the first option.
In<em> Damon and Pythias, </em>the author creates surprise when Dionysius pardons Damon and Pythias.
<em>Damon and Pythias </em><u>symbolizes friendship.</u> In the myth, Pythias is accused of conspiring against Dionysius and condemned to death. In that way, Damon offers himself to be held hostage and also to die in his friend's stead if Pythias does not return. However, when Phythias returns to save Damon's life, <u>Dionysius is so moved by their friendship and their loyalty that he ends up freeing both of them</u>. That is the 'surprise effect' that the author of the myth creates.
The answer is: A) if you don’t buy them in advance.
An adverb clause functions as an adverb, modifying an adjective, verb or another adverb. It contains a subject and a verb, and it provides information as regards how, when, where and why the action happens.
Adverb clauses are also dependent clauses because they cannot stand on its own - they do not express complete thoughts by themselves. As a result, they need to join a main clause in order to make sense. They are joined to main clauses through subordinating conjunctions, such as <em>while, although </em>and <em>if</em>.