Answer:
The allusion to Goliath affects readers' understanding of the passage because:
3. It makes the restaurateur's challenge seem daunting but surmountable.
Explanation:
Allusion is a figure of speech in which the writer mentions a character or element belonging to another well-known story. In this case, the author alludes to Goliath, a character found in the Bible. Goliath was a giant warrior tremendously feared by all. He was, however, defeated by young and small David. By using this allusion, the author implies that the restaurateur is like David, and that the restaurant chains are like Goliath. The same way David was able to face and defeat Goliath, so can the restaurateur win his battle against restaurant chains. With that in mind, we can choose number 3 as the correct option:
3. It makes the restaurateur's challenge seem daunting but surmountable.