Scout Ahead https://www.scoutahead.org/plans/multisport-merit-badge/questions

Which of this applies to you?

Answering these takes the parts that are not for you out of Multisport Merit Badge. Nothing is required, nothing is kept on the server, and nothing is ever hidden because a question went unanswered. A step that might apply to you stays on the list and is marked.

Requirement 3(d): which multisport format?

This one answer decides requirement 4, what requirement 5 trains for, and which race you finish in requirement 7. Three of the four need the Swimming merit badge first, duathlon does not.

Requirement 8: which two will you do?

The badge asks for TWO of the five, each discussed with your counselor. Tick the ones you mean to do and the rest come off the plan. Two of them depend on somebody else running an event, so they are worth choosing early.