In the 1H NMR spectrum of CH3CH2OCH(CH3)2, the ratio of area of various proton signals is 9:2:1.

A. (C6H5)CONH(C6H5)
B. (C6H5)COOH
C. (C6H5)CO(C6H5)
D. (C6H5)CONH2

A. stretching vibration of C-C, C-O
B. stretching vibration of C-H, O-H, N-H
C. stretching vibration of C=C, C=O
D. stretching vibration of C≡C, C≡N

A. moves towards low wavenumber
B. moves towards high wavenumber
C. No change
D. A and B are both possible