Fungi should be the answer.
The correct answer is B. unicellular.
Dinoflagellates are unicellular or multicellular, producers, and autotrophs, and apple trees are multicellular, producers, and autotrophs. All plants have numerous cells in them, so they can never be unicellular. The remaining characteristics they share with less complex organisms such as dinoflagellates.
What we can say about the frequency of x-linked recessive traits is that the frequency of the allele for the recessive x-linked traits is assumed to be equal to the proportion of males with the recessive phenotype.
The answer is D.
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