What happens to the steady state of the series RC circuit if changes happen to any circuit element?
My answer is B

It all depends how they change - if they change to a new static value(s) then &quot;B&quot; is the answer. If they change and continue to change then &quot;C&quot; might be the answer.

My answer is B since, according to the textbook, the transient
response is a circuit's temporary response that will die out with time
and the steady-state response stays for a long time after an external
excitation is applied.

Then there's the consideration of AC transient response.
If the input voltage becomes a sinewave i.e. is continuously changing sinusoidally, then the AC response on the output has a transient response leading to a non-static steady-state response because, the output will also &quot;become&quot; a sinewave (with phase shift) after the transient response has died down.
So, it all depends what you mean.