Option C
Find a longer way to work and enjoy the ride, letting an engine warm up on idle is pretty bad for it for a number of reasons including the neighbour factor, I had to change my stubby exhaust for a bigger one because of this.
While it was being swapped over the engine had to be started and revved with no can or link pipe
It just has to be done... Sorry, I digress, back on topic...
I would say your commute should be about 5 miles to get the oil warmed through so you don't get a condensation build-up in the crankcase, that will show itself as 'Mayo' around the filler cap and possibly visible in the sight glass, remember that the oil takes longer to warm up than the coolant which the temperature gauge monitors.