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According to Naomi Nakayama of the University of Edinburgh, the reason seeds from a dying dandelion appear to float in the air while ______ is that their porous plumes enhance drag, allowing the seeds to stay airborne long enough for the wind to disperse them throughout the surrounding area. Which choice completes the text so that it conforms to the conventions of Standard English?

Afalling,
Bfalling:
Cfalling;
Dfalling
Answer & Solution
Correct answer: D. falling
Choice D is the best answer. No punctuation is needed between the subject ('the reason ... falling') and the verb 'is'. Inserting any punctuation here breaks subject-verb cohesion.
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