Mark the letter that identifies the tone for each of the following sentences.（）When I study now， I’m in a lab with 50 noisy computers.What happened to the quiet chair in a corner with a table for your books， papers， and pencils？

Mark the letter that identifies the tone for each of the following sentences.（）When I study now， I’m in a lab with 50 noisy computers.What happened to the quiet chair in a corner with a table for your books， papers， and pencils？
A.bitter
B.objective
C.nostalgic
正确答案：nostalgic