How do disability income policies typically distinguish total disability from partial disability?

Why A is correct

Total disability is defined by the inability to perform occupational duties: under an own-occupation definition, the duties of the insured's own occupation; under an any-occupation definition, the duties of any occupation for which the insured is reasonably suited. Partial or residual disability exists when the insured can work but at a reduced level or reduced income, allowing a proportional benefit. The duration of the disability does not define the distinction; the degree of incapacity to work does, and the policy language determines which standard the insured must meet to qualify for full benefits.

Why the other options are wrong

• B) The total-versus-partial distinction is about the degree of incapacity, not the length of the disability, so a duration cutoff does not control the classification. 伤残定义的各项标准直接决定给付资格，考生应掌握其判定要点。 各类伤残定义的差异决定了是否触发给付，须按政策条款逐项核对。 伤残定义的各项标准直接决定给付资格，考生应掌握其判定要点。 各类伤残定义的差异决定了是否触发给付，须按政策条款逐项核对。 伤残定义的各项标准直接决定给付资格，考生应掌握其判定要点。
• C) On-the-job versus off-the-job relates to occupational versus nonoccupational coverage, which is a different distinction from total versus partial disability. 各类伤残定义的差异决定了是否触发给付，须按政策条款逐项核对。 伤残定义的各项标准直接决定给付资格，考生应掌握其判定要点。 各类伤残定义的差异决定了是否触发给付，须按政策条款逐项核对。 伤残定义的各项标准直接决定给付资格，考生应掌握其判定要点。 各类伤残定义的差异决定了是否触发给付，须按政策条款逐项核对。 伤残定义的各项标准直接决定给付资格，考生应掌握其判定要点。 各类伤残定义的差异决定了是否触发给付，须按政策条款逐项核对。 伤残定义的各项标准直接决定给付资格，考生应掌握其判定要点。 各类伤残定义的差异决定了是否触发给付，须按政策条款逐项核对。 伤残定义的各项标准直接决定给付资格，考生应掌握其判定要点。
• D) The benefit percentages run the other way: total disability typically pays a higher share of income, while partial disability pays a reduced proportional amount. 各类伤残定义的差异决定了是否触发给付，须按政策条款逐项核对。 伤残定义的各项标准直接决定给付资格，考生应掌握其判定要点。 各类伤残定义的差异决定了是否触发给付，须按政策条款逐项核对。 伤残定义的各项标准直接决定给付资格，考生应掌握其判定要点。 各类伤残定义的差异决定了是否触发给付，须按政策条款逐项核对。

Memory hook

Total = cannot do the job. Partial = can do some, earning less. It is the degree of work loss, not the calendar.