Final answer:
To conduct a representation election, at least 30% (option d) of the anticipated bargaining unit must show interest. This is a prerequisite for such an election which, if held, necessitates a majority vote to pass.
Step-by-step explanation:
The percent of the anticipated bargaining unit required to conduct a representation election is 30%. This means that at least 30% of workers within the proposed bargaining unit must show interest in holding an election for union representation, usually by signing union authorization cards or a petition. It's worth noting that this is just one step in the process, as the actual election will require a majority vote in favor. For example, regarding ordinary laws, most require a majority vote to pass, which is 50% + 1 vote. Additionally, in the context of political representation, the 115th Congress of the United States had 21.2% of elected officials who were women.