Which contains an error in logic as worded?

Wearing bell-bottom pants and a tie-dyed shirt was a fad during the 1960s.

A fad during the 1960s was wearing bell-bottom pants and a tie-dyed shirt.

A fad during the 1960s was someone wearing bell-bottom pants and a tie-dyed shirt.

Bell-bottom pants and tie-dyed shirts were fads during the 1960s