Arrange the following components of an autonomic reflex arc in the proper order:
1) preganglionic motor neuron
2) receptor
3) integrating center (interneurons)
4) postganglionic motor neuron
5) visceral effector
6) autonomic ganglion
7) sensory neuron
A) 7, 2, 1, 3, 4, 6, 5
B) 1, 2, 7, 3, 6, 5, 4
C) 2, 1, 3, 7, 4, 6, 5
D) 2, 7, 3, 1, 6, 4, 5