What type of additional coverage can B purchase under a Whole Life policy with a guaranteed insurability option?

Under a whole life policy with a guaranteed insurability option, the policyholder has the ability to purchase additional coverage at specified times without having to provide evidence of insurability. This means that the insured can increase their coverage amount by purchasing additional whole life insurance, which ensures that premiums remain level and that the policy accumulates cash value.

This option is beneficial because it allows the policyholder to secure additional coverage during events like life changes (e.g., marriage, the birth of a child) or at predetermined ages specified in the policy. Given these intervals, the policyholder does not need to undergo medical underwriting, which can be advantageous if their health status changes over time.

The other options do not align with the characteristics of a whole life policy's guaranteed insurability option. For instance, gaining additional term life coverage, whether at any time or at specified intervals, does not fit within the context of a whole life policy that is primarily focused on providing permanent coverage and cash value accumulation.