Step 1: Understand the concept.
Businessmen play a vital role in the economy by being part of the society and contributing to its growth.
Step 2: Review options.
- Representatives are chosen to speak on behalf of others, but not necessarily businessmen.
- Members are part of a group, which fits the description of businessmen in society.
- Trustees have specific duties and responsibilities but are not commonly used to describe businessmen in general.
Step 3: Conclude.
Therefore, the correct answer is Members.
Final Answer:
\[
\boxed{\text{Members}}
\]