Hitler intended to defeat great britain by
a- a massive bombing attack
b- an aggressive use of tanks
c- an attack on the air force
d- a mass invasion of troops

Hitler intended to defeat Great Britain by "A- a massive bombing attack" since a crossing of the English channel would have required far more effort. He failed in this endeavor however. 

The answer is    "illustrate why one's dreams need to be pursued in a logical order if success is to be obtained"  so c is the answer. : )