Answer:
3.Ease
Explanation:
This means that the child is now used to it and doesn't need help or assistance in reading the story.
The word with an affix that means "full of" is D. Stupendous. Stupenduos contains an adjective suffix which means "full of". Other examples like the words 'Poisonous', meaning full of poison and 'joyous' meaning full of joy. Stupendous means astounding or extraordinary.
My guess would be so that you can recognize what feels right or wrong and treat others fairly.