The answer is C. Appear is a verb and singular verbs normally end in -s. Also the sentence is talking about the conductor, not the pictures.
Yeah... the asnwer is letter choice A... it makes the most sense
Worth, worthy, useful, valuable, profitable, interesting, meaningful, praiseworthy, commendable, rewarding, desirable, laudable, advantageous, noteworthy, creditable, cost-effective, appropriate, notable, suitable, penalty, instrumental, purposeful, substantial.
