Hello - I am doing a practice quiz and would really appreciate your help! Thank you

Question 8 Consider two-sided, one-to-one matching between singers and musicians. What does it mean for Sue the Singer to be "unacceptable" to Mark the Musician? O Sue is unwilling to match with Mark. Mark prefers being unmatched to being matched with Sue. There is at least one other singer whom Mark strictly prefers to Sue. O There is at least one other singer whom Mark strictly prefers to Sue and who is willing to match with Mark. O Mark ranks all other singers strictly ahead of Sue. Question 9 Consider two-sided, one-to-one matching between three women (Xena, Yasmeen, and Zelda) and three men (Arnie, Barney, and Calvin). Their ranking are as follows: Arnie: Xena, Yasmeen, Zelda, Arnie Barney: Yasmeen, Zelda, Barney, Xena Calvin: Xena, Zelda, Calvin, Yasmeen Xena: Arnie, Barney, Calvin, Xena Yasmeen: Barney, Calvin, Arnie, Yasmeen Zelda: Barney, Arnie, Zelda, Calvin Which of the following matchings is efficient? O Arnie:Arnie, Barney:Barney, Calvin:Zelda, Xena:Xena, Yasmeen: Yasmeen O Arnie: Yasmeen, Barney:Xena, Calvin:Calvin, Zelda:Zelda O Arnie:Xena, Barney:Yasmeen, Calvin:Zelda O Arnie: Yasmeen, Barney:Xena, Calvin:Zelda O Arnie:Xena, Barney:Barney, Calvin:Zelda, Yasmeen: Yasmeen