Please Read the Clinical Scenario, and Then Answer the Question

Please read the clinical scenario, and then answer the question that follow to become familiar with the traditional NCLEX question format.
As a triage nurse in the ER, you begin the assessment of an elderly patient complaining of bloody diarrhea and severe stomach cramps. You find the patient has a fever of 104oF as well, and is showing signs of dehydration. IV fluids are administered while further analysis of the patient continues.
-Gram staining reveals the presence of gram-negative bacilli in the patient's stool.Thinking about the patient's spike in temperature,you understand now how this bacterium could cause a fever.Which of the following is the correct explanation?

A) Gram-negative bacteria have a thick peptidoglycan layer which confers their ability to cause fever.
B) Gram-negative bacteria have two periplasmic spaces which enhance their ability to cause fever.
C) Gram-negative bacteria have porin proteins in their outer membrane which confer their ability to cause fever.
D) Gram-negative bacteria have lipopolysaccharide in their outer membrane,and the lipid portion confers their ability to cause fever.