Answer:
a coherent and considered movement from a claim to a conclusion; a process of reasoned inquiry
If my memory serves my well, the reason why Squealer changes the Commandments is B. to reflect the pigs' adapting human qualities. This option looks the most accurate and, as for me, best represents the reason of change. Hope you will agree with me, regards!
I think you're talking about a participal phrase.
Ex:Awakened by the blaring horns,Aaron looked out the window.