The interest that an insurance company earns on life insurance premiums paid helps to:

Detailed Answer in Step-by-Step Solution:

Life insurance premiums are calculated based on three factors: mortality (death rates), interest (investment earnings), and expenses (operating costs).

When an insurer earns interest on premiums invested, it increases the funds available to pay claims, reducing the amount needed from policyholders.

This results in a decrease in the premium rate (C), as higher interest earnings offset the cost of coverage.

Option A (increase premium rate) would occur if interest earnings decreased.

Options B and D (mortality rate changes) are unrelated to interest, as mortality is a statistical factor, not a financial one.

The Virginia study guide explains that interest earned on premiums is a key component of pricing life insurance, allowing insurers to lower premium rates when investment returns are favorable. Reference: Virginia Life, Annuities, and Health Insurance study guide, section on "Premium Determination."