Answer:
D. The distribution is nontaxable, and Miranda does not need to report it
This is a non-taxable expense from Oak to Miranda, with no tax penalties until she sells the portions.
This is neither an regular dividend nor a competent dividend. The latter ascends only when the said portions are held for so long as to appeal lower long-term capital gains.
This cannot be described in Schedule D as neither capital expansion nor loss is tangled as no sale has taken place.