I forgot to give my answer in time last contest so I will give it more promptly this time.

My choice is nr. 3: After every expansion, recession follows and it is a normal process.

Since this economic theory is one of rolling waves. One period is a low and another is a high with two in between ones when the economy either scales down or rises up again.
The author does seem to thinks this is a natural process and the way the economy functions in most countries.

Plus the other 5 statements doesn't quite feel right for some reason - at least to me they don't.