Final answer:
A missionary associate typically assists long-term missionaries with their specialized skills for about one to two years on the mission field.
Step-by-step explanation:
The role of a missionary associate in the mission field varies but typically involves assisting a career missionary in their specialized area of work for a set period, usually one to two years. Option c) best describes the typical role, which is to support long-term missionary efforts by contributing specific skills and aiding in ongoing projects or mission work. This can range from administrative duties to offering technical expertise or participating in outreach activities.