Final answer:
A missionary Faith Promise is a voluntary commitment to give a specific amount to missions, made in faith that God will provide the necessary funds.
Step-by-step explanation:
The phrase that best describes a missionary Faith Promise is d) A promise to give a specific amount to missions, trusting God for the resources. A Faith Promise is a spiritual agreement made by an individual or a church congregation to contribute a set amount of money to support mission work. This commitment is made in faith, believing that God will provide the necessary funds. It is not secured by a promissory note or any legal obligation; rather, it's a voluntary, faith-based decision to allocate funds for the purpose of advancing religious missions.