Question

read the passage and then answer the question.
in 1860, the pony express was started. it was created to meet the demand for faster mail service between california and the eastern states. pony express riders carried their bags of mail long miles over rugged western trails. during their routes, the riders faced many dangers. for example, many riders told stories about encounters with wild animals and robbers. despite these dangers, pony express riders were known to be very fast. they were able to carry word of abraham lincolns election as president from nebraska to california in just five days. in less than two years, though, the pony express became obsolete. once the telegraph was invented, there was no need for the pony express.
what is the meaning of obsolete as used in the passage?
improved by editing or revising
strengthened by a new law
replaced by something newer
bankrupted from overspending

Explanation:

The passage states that once the telegraph was invented, there was no need for the Pony Express. This implies that the Pony Express was replaced. The word "obsolete" in this context means replaced by something newer.

Answer:

replaced by something newer