Concept:This question tests the possessive form of an irregular plural noun.Explanation:The noun "children" is the plural of "child". It is an irregular plural because it does not end in "s". For a plural noun that does not end in "s", we show possession by adding an apostrophe and "s": children + 's = children's. Hence, the correct expression is "The children's toys". The other options are incorrect because they are not proper possessive forms.Answer:D. children's