Final answer:
The assignment of a general missionary varies; it may need renewal, offer training, be specialized, or require a lifelong call and skills, depending on the mission organization's guidelines.
Step-by-step explanation:
The assignment of a general missionary varies depending on the context and the mission organization's rules. Generally, option (a) mentioning renewal every four years could be accurate for certain organizations that require periodic reaffirmation of commitment, while option (b) describes a scenario where a new missionary is given on-the-field training under the mentorship of an experienced missionary, which is often considered a short-term assignment. Option (c) mentions specialized ministries, which suggests that the person is involved in a specific area of service, possibly unrelated to general missionary work. Lastly, option (d) refers to a lifelong call, which implies a more permanent commitment to general missionary work, often accompanied by practical ministry skills. It's important to note that while missionaries do approach individuals and operate in various regions, the quote provided reflects historical perspectives on missionary work and does not directly answer the question.