Answer: Mrs. Bennet asked Jane to ride to Nether field on horseback because Mrs. Bennet wanted Jane to spend some time with Mr. Bingley so, she asked Jane to ride to Nether field on horseback as she knew that the rain was about to fall and she would drench and would catch a cold and fever and would not be able to come back.
Step-by-step explanation: Mrs. Bennet didn't like Jane.