Mode is scale is the only one to use the interval of a 3rd. Octave-repeatable is the mode of permutation is scale which have start and end point shifted.
Excluding any upbeats or anarcrusis, take the lowest beginning note in the first downbeat in the left hand. Make the same amount of steps along the sequence of modes. You've found your mode. For example, the leading scale is quotable at the octave.
Thus, option A is correct.
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