C is the right one. 带有应该在，本应该在这里的意思，结合后面的问句所以应该选C.蛋糕在哪里啊？今天早上就应该在这里的啊。你是说蛋糕在桌子上吗？
c
Where is the cake now? It (C) here this morning. Do you mean the cakeon the table?
