根据上下文补全对话.

Li Min: Hello! How are you?

Lucy: 1______, thank you.

Li Min: Are you Lily?

Lucy: No, 2______ Lucy.

Li Min: Sorry. You 3______ Lily look 4______ 5______. Is Lily here, too?

Lucy: No, she is not 6______ school today.

Li Min: 7______ is she?

Lucy: She's not well today.

Li Min: Where is she? 8______ she at home now?

Lucy: I 9______ she is.

Li Min: Look! 10______ that girl over there? That's Lily! Hi, Lily, how 11______ you?

Lucy: I'm 12______ now. Thank you.

甲向乙借款5万元，还款期限6个月，丙作保证人，约定丙承担保证责任直至甲向乙还清本息为止。丙的保证责任期间应如何计算

A．主债务履行期届满之日起6个月

B．借款发生之日起2年

C．借款发生之日起6个月

D．主债务履行期届满之日起2年