Plz Help Which of the following sentences would a proofreader need to correct?

According to statistics from the International Alliance of Zoos, only three other zoos in the world have successfully birthed polar bear cubs in captivity.

“Giving birth to polar bear cubs in captivity is very difficult.” Says zoo director Mike

Williams. So, we’re very excited by this prospect.”

The population of the Metropolitan Zoo is increasing by two, zoo officials told reporters on Tuesday.

According to zoo officials, the baby polar bears are expected to arrive just in time for Christmas.