Let A = {2, 3, 4, 5, 6, 7} B = {2, 4, 7, 8) C =
{2, 4}. Fill in the blanks by ⊂ or ⊄ to make
the resulting statements true.
(a) B __ A
(b) C __ A
(c) B __ C
(d) ∅ __ B
(e) C __ C
(f) C __ B