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What is the correct phase shift in CE amplifier?

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What is the correct phase shift in CE amplifier?

(a) 45 degrees

(b) 180 degrees

(c) 60 degrees

(d) 120 degrees

The question was posed to me in a national level competition.

My question is from CE Amplifier with an Emitter Resistance topic in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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The correct option is (b) 180 degrees

To explain I would say: The negative alternation of an AC signal will cause a decrease in the base current.  This action then causes a corresponding decrease in emitter current through RL(load). The output signal of a common- emitter amplifier is therefore 180 degrees out of phase with the input signal.

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