Decide, among the following sets, which sets are subsets of one and another

According to the question,

We have,

A = {x: x ∈ R and x satisfies x² – 8x + 12 =0}

2 and 6 are the only solutions of x² – 8x + 12 = 0.

Hence, A = {2, 6}

B = {2, 4, 6}, C = {2, 4, 6, 8 …}, D = {6}

Hence, D ⊂ A ⊂ B ⊂ C

Hence, A ⊂ B, A ⊂ C, B ⊂ C, D ⊂ A, D ⊂ B, D ⊂ C