Testamentary capacity refers to:

A) the age of the testator.
B) the same capacity as required to contract.
C) the ability to understand the nature and extent of one's property, to appreciate the natural objects of one's bounty, and the ability to formulate an orderly plan of disposition.
D) the influence of others over the testator.

Testamentary capacity involves the mental capability of an individual to understand the nature and extent of their property, recognize the natural beneficiaries of their estate, and devise a coherent plan for the distribution of their assets upon death. This concept is distinct from the general capacity required to enter into contracts or the influence of others, focusing instead on the specific understanding and intentions regarding one's estate planning.