in case anyone is wondering the answer is A.

e. Just one, but wouldn’t it be better to spend 6 months making a program that screws in light bulbs automatically? We could save a whole minute of developer time per bulb. It’d pay for itself in developer time after just… lessee… 6 months times 30 days per month times 24 hours per day times 60 minutes per hour… 2.6 million automated bulb screw-ins or so.

e. Two, but the real trick is getting them in there…

{Alt}-X

D. Final answer.