Initially I would have thought options B and C are classified as aerial work and therefore require a commercial licence. However.....
D sounds plausible as you are not being paid for flying the aircraft (presumably you're being paid for other services to the company). But, use of the company aircraft (with company paying the bills) may be regarded as renumeration (like a company car). Which would require you to have a commercial licence again.
A is a little grey. Technically you could say that is the job of a cargo pilot and therefore a revenue flight, again requiring a commercial licence.
Option B doesn't state that you are being paid for the aerial advertising so this may be the caveat that makes B correct. Does sound wooly though.
Good luck!