For the following sentences, select the underlined portion that contains the error.

9. Because of (A) his failed drug test, (B) which revealed the presence of the steroid stanozolol, Ben Johnson's gold medal from the 1988 Olympics was passed to Carl Lewis, (C) who in the same event became the world record holder in the 100-meter dash.

can we refer Johnson to pronoun his because both are in possessive form or not?