Neil Answer C fits best, the cloudbase obviously lowers as the front is approaching, starting with Stratiform cloud, Cs and some Ci, then this becomes As and then Ns, then ahead of the warm front the precipitation is falling from the Ns in the overlying warm sector which will cause some broken St fractus below it in the cold sector.
Remember for altimeter problems, work out the barometric errors first, then correct for temperature difference from ISA, see if this is of any use.
There is a 4% height difference in true altitude from your indicated altitude for every 10ºC difference in air mass temperature, that is for every 10ºC of ISA temperature deviation.
Example:
Barometric corrections show that at an indicated FL50 the indicated altitude would be 4800ft in ISA conditions. The air mass temperature is ISA minus 15ºC. What is the true altitude?
Solution:
The Rule of Thumb correction is 1.5 x 4% x 4800 = 288ft. The air is colder than ISA, so the altimeter is overreading, and the true altitude is 48000 – 288 = 4512ft
Remember Cold air will make your Altimeter overread, and warm air will make your altimeter underread
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