Final answer:
The policy specifically spelled out in the 1931 Missionary Manual is the requirement that missionaries be financially responsible for medical care whether on the field or in the U.S.
Step-by-step explanation:
The policy specifically spelled out in the 1931 Missionary Manual is a) The requirement that missionaries be financially responsible for medical care whether on the field or in the U.S.. This policy stated that missionaries had to bear the financial responsibility for their medical care regardless of their location. This meant that missionaries had to plan and budget for their medical expenses while on the field and also when they returned to the U.S.