Read the sentences.

the siblings were like cats and dogs when left alone together. as a result, the babysitter was careful to keep them separated as much as possible.

the author most likely uses the simile to emphasize that

a. the siblings were unusually hairy.
b. the siblings did not get along well.
c. the babysitter was not fond of animals.
d. the babysitter was actually taking care of animals.

The author most likely uses the similie, "The siblings were like cats and dogs," to emphasize that the siblings did not get along well (B).

Even though there are cats and dogs that get along well, generally they are like fire and ice, complete opposites. Cats and dogs do not get along and apparently neither do these siblings. The author uses the similie to give the reader more imagery than simply stating the siblings don't get along.

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