Answer
B.
Work Step by Step
A., C., and D. are all wrong since they state things which are true for Gram-positive or Gram-negative bacteria but not both (C., D.) or simply false (A.).
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.