Concerning Sterile Preparation of the Operative Site, Which Statement Is

Concerning sterile preparation of the operative site, which statement is most accurate?

A) Hair on the surgical site can be adequately clipped with a No. 10 blade.
B) Scrubbing should start at the periphery of the clipped area and move toward the center.
C) Isopropyl alcohol provides excellent skin disinfection and can be used alone if at least 5 minutes of contact time is allowed.
D) Two 30-second applications of chlorhexidine scrub will be adequate for antimicrobial activity.