I agree with your answer on intensity, amplitude, wavelength and speed.
Since the question stated "
a particular frequency " and speed is the same
(v=fλ), frequency should be the same.
When you said you don't quite get about the phase part, I assume that you know what is phase if not check out this
link.
Phase with respect to the source - Should be the same assuming that the source is not emitting light randomly. It is same as the distance between the source and the point on the wave is constant.
Hope it is simple to understand.