Which represents a correct expression of agreement?

a. Adequate surgical prep, including Betadine scrub and sterile draping, were accomplished.
b. Most of the team are attending the conference being held across the street.
c. The compelling nature of the acidosis, not the presence of a presumed toxin, was felt to be the diagnostic indicator.
d. Her family history, but not her other risk factors, are worrisome for heart disease.