Which sentence uses informal language? Roman architects built aqueducts to transport water across the entire city of Rome. Rome had more advanced infrastructure than other cities of the same size. The emperor Augustus built public baths to promote good hygiene and reduce illness. The guy in charge of Romans thought dirty people were gross, so he made public baths. (ILL MARK FIRST/CORRECT BRAINLEST)

"The guy in charge of Romans thought dirty people were gross, so he made public baths," is the sentence that uses informal language.

In comparison to the other sentences, this one has a very casual nature. The choice of words are more simple, familiar, and less informative.

there is no image for me to refer

food and resources were plentiful.

women were encouraged to marry later in life so they could work in factories.