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"which sentence is a correct example of an in-text citation?

a. according to peter vilonen's biography of the athlete, henie's family was wealthy enough for her to pursue her skating dreams. (peter vilonen 72)
b. henie's biographer, peter vilonen, believes that henie "truly was the best performer ever" (vilonen 67).
c. according to peter vilonen's biography of the athlete, sonja henie won three olympic gold medals as a norwegian figure skater (59).
d. henie's biographer, peter vilonen, relates that "sonja finished last in her first event when she was only eleven"(vilonen 38).