The correct option is D c. Endosperm
Free nuclear division
Free nuclear division is a type of division in which karyokinesis (nuclear division) in a cell is not followed by immediate cytokinesis (cytoplasmic division). It results in the presence of multiple nuclei in the cytoplasm.
Coconut endosperm
Free nuclear division is observed in the endosperm of angiosperms like coconut. Coconut water is a liquid free nuclear endosperm that has thousands of free nuclei.
Final answer
c. Endosperm.