Which type of policy would likely cost less if it provides additional term life coverage?

A term rider policy is designed to provide temporary additional coverage on top of an existing permanent life insurance policy, such as a whole life policy, at a lower cost compared to purchasing a separate term life policy. The key advantage of a term rider is its affordability; it allows policyholders to increase their life insurance coverage for a specified period without significantly raising their premium costs compared to standalone options.

Unlike a whole life policy, which has higher premiums as it includes a savings component and offers coverage for the policyholder's entire life, a term rider leverages the existing policy to keep costs manageable. This makes it an attractive option for those who need extra coverage for a limited time, often to cover specific financial responsibilities, such as raising children or paying off a mortgage.

The other options do not generally offer the same cost-efficiency for additional term coverage. A substandard policy typically comes with higher premiums due to increased risk factors, and a non-participating policy does not involve dividends which could help mitigate costs. Thus, when seeking economical term life coverage within an existing policy framework, the term rider option stands out as the most cost-effective choice.