Arrange the Following in a Logical Sequence:
(1) Lock (2) Door (3) Key (4) Switch on (5) Room
(a) 4, 3, 1, 2, 5 (b) 5, 4, 3, 1, 2 (c) 3, 1, 2, 5, 4 (d) 4, 5, 2, 1, 3