How long must premiums for whole of life assurance typically be payable?

Whole of life assurance is designed to provide coverage for the entire lifetime of the insured, which means the insurance does not expire after a set term. The premiums are typically payable until the insured individual passes away. While some policies might allow for the premiums to end at a certain point, the standard provision is that they continue for the lifetime of the insured. Therefore, the correct answer indicates that premiums must be paid for the entire life of the insured.

Given this understanding, it is clear that options suggesting a fixed number of years (5, 10, or 15) do not align with the fundamental premise of whole of life assurance, which emphasizes lifelong cover. This option reflects an important detail of policy mechanics, reinforcing the security and continuity provided by such insurance products.