Which revision of Sentence 21 contains correct punctuation?

Question

Answer choices for the above question

Without using, echolocation it would be difficult for bats to catch their prey.

Without using echolocation, it would be difficult for bats to catch their prey.

Without using echolocation it would be difficult, for bats to catch their prey.

Without using echolocation it would be difficult for bats, to catch their prey.

Answer 1

The correct revision of Sentence 21 with appropriate punctuation is:

Without using echolocation, it would be difficult for bats to catch their prey.