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Why are pulse pairs used in DME instead of single pulses?

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Why are pulse pairs used in DME instead of single pulses?

(a) Reduce interference

(b) Better range

(c) Reduced noise

(d) Redundancy

The question was posed to me at a job interview.

I would like to ask this question from Point Source Radio Systems in division Terrestrial Radio Navigation System of Avionics

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Right option is (a) Reduce interference

Easy explanation: Pulse systems can easily interfere with each other even if they are of different frequencies. Paired pulses are used in DME to reduce interference with other pulsed systems.

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