Answer:
The three phrases which complete the sentence (in their right) are:
A, D and C.
Explanation
Every action begins as a thought. So it's reasonable to put 'A' first. Resolutions begin in the mind.
The last sentence 'C' reports some kind of conclusion. "He pushed through difficult circumstances."
'D' tells us how: He pushed through difficult circumstances by "applying strategy to the need at hand"
Cheers!