Who is considered a "Child" of the policyholder under the Abacus policy terms?

The question asks to define "Child" under the Abacus policy terms. Insurance policies typically have broad definitions for dependents to ensure comprehensive coverage.

• Options A, B, and D are restrictive, limiting the definition to only biological, only stepchild, or only legally adopted children, respectively. These are generally too narrow for a comprehensive policy.
• Option C provides a broad definition that includes various types of children: biological, stepchild, child of a common-law spouse, illegitimate child, and legally adopted child, with the common condition of being unmarried. This inclusive definition is typical for insurance policies to cover a wide range of family structures.

Therefore, the most appropriate definition is the one that covers the broadest range of dependents.

The correct option is C.

C) Any unmarried child of the policyholder, including a stepchild, child of any common-law spouse, illegitimate child, or legally adopted child.