Final answer:
The type of trust described is a charitable remainder annuity trust, where the grantor receives a fixed income interest each year and the remaining assets pass to a charitable organization.
Step-by-step explanation:
The type of trust described in the question is a charitable remainder annuity trust.
In a charitable remainder annuity trust, the grantor transfers assets to the trust, and receives a fixed income interest each year, which is determined as a percentage of the initial value of the trust. At the end of the trust term, the remaining assets pass to a charitable organization, in this case, St. Ophelia's Hospital for Children.
Therefore, the correct answer is option d. a charitable remainder annuity trust.