Hi, Wavydaniela :)
When someone tells a poignant story about living in a squalor, the moral reason that I could think of is that he wants to inspire someone. People would get motivated when a rags-to-riches story actually happens in real life. He might recall his early struggles and how he won over them to make them realize that as long as there is hope, you could always rise up and recover.
I hope I was able to answer your question :)
I would say answer A because none of the other responses make sense with the context given. The father only picked out the parts in life he wanted to live by and that he believed in. Those things were important to him if he chose to live by them, hence him “knowing the important things in life”.
I believe the correct answer is C.
Yah buddy so you know me the rockstar