Answer:
D. And there was a custom, besides, that he meant to keep, 
That he had assumed in his noble way
Step-by-step explanation:
Took the quiz....
Also the letters are a little off for these answers. Here is how the options actually are:
A--He seemed full of the joy of youth, almost a boy. 
B--He was happy with his life; he cared little 
For lying in bed or sitting still for a long time 
C--His young blood so stirred him and his wild brain. 
D--And there was a custom, besides, that he meant to keep, 
That he had assumed in his noble way