Both Miyax from Julie of the Wolves and Tom from The Adventures of Tom Sawyer are brave, strong, and independent young people. Miyax has to learn how to live on her on in the Arctic whereas Tom is in charge or running his own group of 'misfits' - he acts as sort of a leader for them. Both of them are curious kids who want to explore what's out there and learn new things - they are not afraid of challenges; as a matter of fact, they take them head-on. Miyax learns later in her life how to live in the wilderness with wolves; Tom reveals a crime and helps the police arrest the murderer all while jeopardizing his own life.
On the other hand, Miyax is much more mature than Tom is in childhood. Tom is still a boy who likes doing childish pranks and teasing people. Miyax is a serious child who has to learn how to live in society after being in the wilderness for so long. Although Tom grows up to become a more mature person, in childhood, the lack of maturity is what differentiates the two.
D. He acts like he's going to cry. Even though it might seem correct, but gramatically it's totally wrong. There should be other <span>subordinating conjunction</span> such as "as" indeed. Hope it will help.