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What is the phase-shift between input and output voltages of CE amplifier?

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What is the phase-shift between input and output voltages of CE amplifier?

(a) 90°

(b) 120°

(c) 180°

(d) 270°

I had been asked this question in an interview for job.

Enquiry is from Comparison of Transistor Amplifier topic in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Correct option is (c) 180°

To elaborate: During the amplification method of RC coupled CE amplifier, there is a phase shift of about 180o between input and output. Basically, the output is said to be reversed version of input.

The magnitude of output voltage becomes higher as compared to that of input signal but the shape is correctly similar to that of an input signal.

But, the input ac signal gets amplified along with the phase-shift of 180o between input and output.

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