An insurable interest in each other's lives may exist in the absence of an economic...

Comprehensive and Detailed Step by Step Explanation:

For life insurance, an insurable interest exists when there is a legitimate interest in the continued life of another person:

Marriage partners (C) inherently have insurable interest due to emotional and legal ties.

Competitors (A) and traveling companions (D) do not usually meet the legal threshold.

Business associates (B) may have insurable interest, but only in specific agreements (e.g., buy-sell agreements).