IASB's definition of significant insurance risk:

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The idea being tested is how to identify when a contract contains significant insurance risk under IASB standards. It’s about whether an insured event could lead to the insurer paying materially more benefits than expected, and this must be possible in any scenario that has commercial substance (scenarios that aren’t plausible aren’t considered). In other words, if an insured event could force the insurer to pay substantial additional benefits beyond what is expected, the contract contains significant insurance risk.

This is why the correct statement fits best: it centers on a possible, material change in the insurer’s cash outflows due to insured events, assessed across plausible scenarios.

The other options don’t fit the definition: significant risk isn’t about small reserve overruns, nor about potential losses the reinsurer might face, nor about policy lapses or renewals.