Identify the sentence with correct subject-verb agreement.
(a) Dental veneers made of porcelain or plastic can covers chipped, stained, or crooked teeth.
(b) Denatl veneers made of porcelain or plastic can hides chipped, stained, or crooked teeth.
(c) One of the athletes in the weightlifting competition was disqualified for using an anabolic steriod.
(d) One of the athletes in the weightlifting competition were disqualified for using an anabolic steriod.
I don't think its (a) because of covers, (b) because of hides. I'm undecided between (c) and (d) because of was or were. I think it's (c) because one of the althletes.
