What is a trust document primarily used for in estate planning?

A trust document is fundamentally designed to manage and distribute assets based on the specific terms set forth by the trustor, who establishes the trust. This document provides detailed instructions on how assets should be handled during the trustor's lifetime and after their passing, including how they are to be allocated to beneficiaries. It can include stipulations about the timing and conditions under which assets are distributed, aiming to fulfill the trustor's intentions regarding their estate.

Trust documents also often allow for more flexibility and control over asset management compared to wills. They can help avoid probate, provide for the care of minor children, and protect assets in case of incapacity, all tailored to the unique needs of the trustor and their beneficiaries. This makes option B the most precise and relevant description of a trust document's primary function in estate planning.