Answer : C
Given Set $A = \left \{ 1,2,3 \right \}$ and Partial Order relation : $\leq$ (less than or equal to)
So, Hasse diagram will be a Line. Hence, It is a Total Order relation (because Every Two elements are Related) or Chain.
And Every Chain is a Distributive lattice (Because Straight line cannot contain Kite or Pentagon Sublattice ), So, Option C True.
And A Chain is Complemented Lattice only if it has exactly Two elements.
And A Chain is Boolean Algebra only if It has exactly 2 elements.
NOTE that A Boolean algebra with only one element is called a trivial Boolean algebra or a degenerate Boolean algebra. (Some authors require 0 and 1 to be distinct elements in order to exclude this case.)
