Correct answer is (d) modular, sublattice
To elaborate: A lattice (L, ∨, ∧) is modular if for all elements a, b, c of L, the following identity holds->modular identity: (a ∧ c) ∨ (b ∧ c) = [(a ∧ c) ∨ b] ∧ c. This condition is equivalent to the following axiom -> modular law: a ≤ c implies a ∨ (b ∧ c) = (a ∨ b) ∧ c. A lattice is modular if and only if it does not have a sublattice isomorphic to N5.