Final answer:
The social security system can pay full benefits until 2033, after which it is expected to pay about 80% if no changes are made.
Step-by-step explanation:
The trustees of the social security system have reported that, under current law, the Social Security Trust Fund is expected to be depleted by 2036. Following this, the system is projected to be able to sustain around 75-78% of promised benefits. Therefore, the correct answer to the question is that the social security system will be able to pay full benefits until 2033, and after that, approximately 80% of benefits can still be paid even if no changes to the system are made.