Answer:
The event that is likely to cause force liquidation of your position is:
C) Both A and B
Both scenarios described in options A and B could lead to force liquidation of your position:
A) When the margin cushion (the difference between the value of your position and the required margin) falls to zero or becomes negative, it can trigger a margin call, leading to force liquidation if you fail to meet the margin requirement.
B) If your account doesn't have enough equity to receive or deliver post-option expiration positions, it can also lead to forced liquidation of your position to meet the obligations.
Therefore, both conditions mentioned in options A and B could result in force liquidation, making option C the correct choice.