Explanation
$$\textbf{Step -1: Finding the number of dimensions of a solid.}$$
$$\text{A solid has length, breadth and height as dimensions.}$$
$$\therefore \text{ A solid has 3 dimensions.}$$
$$\textbf{Hence, a solid has 3 dimensions.}$$
$$\textbf{Step-1: Comparing with trapezium}$$
$$\text{The definition of a square does not comply with the}$$
$$\text{definition of a trapezoid. The definition of a trapezoid}$$
$$\text{is a quadrilateral (a closed plane figure with 4 sides) with exactly one pair of parallel sides.}$$
$$\textbf{Step-2: Comparing with other option}$$
$$\text{On the other hand, a square is a very special kind of}$$
$$\text{quadrilateral; A square is also a parallelogram because}$$
$$\text{it has two sets of parallel sides and four right angles. A}$$
$$\text{square is also a parallelogram because opposite sides}$$
$$\text{are parallel. A square is always a rhombus. A rhombus}$$
$$\text{is a quadrilateral with four congruent sides. If the rhombus has 4}$$
$$\text{right angles it may also be called a square. So every square is a rhombus.}$$
$$\textbf{Hence , Square is not a (C) trapezium}$$
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