Check the Following Paragraphs for Unity

Check the following paragraphs for unity. Then select the letter of the sentence that does not belong in the paragraph.
-(1) Although a jellyfish sting is usually painful, it can be treated without having to go to the hospital or doctor's office. (2) First of all, rinse the raised welt on the skin with saltwater. (3) Never use fresh water because it causes the jellyfish tentacles to release more venom. (4) Jellyfish are tough to spot as they're bobbing in the waves, and some areas are known to have large populations of the creatures. (5) An ointment for sunburn or bug bites can be applied to the welt to help reduce the pain. (6) Or, try the technique used by many Hawaiian lifeguards. (7) They make a paste of meat tenderizer mixed with vinegar, smear the paste on the welt, and leave it there for a few minutes. (8) Applying an ice pack will also help to reduce the swelling.

A) sentence 2
B) sentence 4
C) sentence 8