- Rationale for my choice of destination.
- Destination A. was unacceptable because it would put the light beam’s arrival at A. before it finished it’s first leg of the journey.
- Destination B. was unacceptable because that would make its arrival at the end of its first leg of its journey simultaneous with its arrival at the end of its second and final leg of its total journey.
- Destination C. was unacceptable because, although its arrival at C. would be after its completion of the first leg of its journey, its journey along the second leg would be at more than the speed of light c.
- Destination D. was the correct choice because:
- It’s the only destination left, and
- It’s the only route along which the light beam travels at the speed of light c.
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