First it is better to understand what is short tail and Long tail insurance.

Short-tail (risk)

A type of insurance where claims are usually made during the term of the policy or shortly after the policy has expired. Property insurance is an example of short tail business. The opposite of short tail business is long tail business.

"Long Tail" refers to the length of time between a claim causing incident and the settlement of the resultant claim. Property insurance is "Short Tail."Example, it is typically only a matter of days or weeks between the time of fire or tornado damage and the resultant claim being paid. On the other hand, Medical Malpractice and Workers' Compensation claims often continue for years before they are settled. Reinsurance for such short tail lines of insurance is known as short tail reinsurance

Hence , all first three options are property reinsurance therefore , 

Option (D) is correct .

Treaty Casualty Proportinal