Answer:
A) Sell short 100 ABC at 69.45 Stop
Explanation:
When an order is placed below the market (OBLOSS - Open Buy Limits Open Sell Stops) it will be adjusted on the specialist's book for distributions on ex date. This open sell stop order = $70 - $0.55 (dividend) = $69.45
So the adjusted order will be: Sell short 100 ABC at 69.45 stop.