Larry reviewed several randomized clinical trials focused on the use of chlorhexidine mouthwashes in mechanically ventilated patients. What would be a key factor for Larry to look for in the Methods section of the paper? a. The person evaluating whether or not the patient developed pneumonia was not aware of the group assignment b. The sample was drawn from the same age group c. The ventilators were the same brand d. The oral care was conducted at the same time of day