Ineed ! which those 3 answer will be the best? there passage, read it, answer question.
(1) when we call someone “pig” or “swine,” we do not mean it as a compliment. (2) but pigs do not deserve to be used as a symbol for an insult. (3) they are probably not as dirty as they are made out to be. (4) according to one pig keeper, swine are very clean when allowed to live in a clean environment. (5) he feels that pigs are usually dirty simply because their keepers don’t clean their pens. (6) in any case, no one has proven that the pig that wallows in mud prefers that to a cool bath. (7) furthermore, pigs are smarter than most people think. (8) many farmers, for example, have observed that pigs frequently undo complicated bolts on gates in search of adventure or romance. (9) so the next time you call someone a pig, perhaps he or she ought to be someone you wish to praise.

7. what example is used to show that pigs are smarter than they are often
thought to be?

a. they can undo complicated bolts on gates.

b. they search for adventure and romance.

c. they prefer a cool bath to wallowing in mud.