He does unpaid work for the Red Cross.

The correct answer is C. Honorary.

An honorary title is a title that is given to someone as a mark of respect or distinction, but does not confer any official status or authority. For example, someone might be given an honorary degree by a university, even if they have not completed the usual course of study.

In the case of the Red Cross, volunteers are often given honorary titles, such as “Honorary Life Member” or “Honorary President.” These titles are given to recognize the volunteer’s dedication and service to the organization.

The other options are incorrect for the following reasons:

• A. Honorific is an adjective that means “giving honor or distinction.” It is not a noun, so it cannot be the answer to the question.
• B. Honest means “truthful and fair.” It is not related to the concept of honorary titles.
• D. Honourable is a British spelling of the word “honorable.” It is not the correct answer to the question, as the question is asking for a noun, not an adjective.