Question ID:PT20 S3 Q21 Passage:At an evening concert, a total of six songs‚ O, P, T, X, Y, and Z‚ will be performed by three vocalists‚ George, Helen, and Leslie.  The songs will be sung consecutively as solos, and each will be performed exactly once.  The following constraints govern the composition of the concert program:Y must be performed earlier than T and earlier than O.P must be performed earlier than Z and later than O.George can perform only X, Y, and Z.Helen can perform only T, P, and X.Leslie can perform only O, P, and X.The vocalist who performs first must be different from the vocalist who performs last. Stem:Which one of the following is a complete and accurate list of the songs any one of which could be the last song performed at the concert? Correct Answer Choice:DChoice A:O, P, Z Choice B:O, T, X Choice C:T, P, Z Choice D:T, X, Z Choice E:X, P, Z