The topic sentence of the following paragraph would be A. Chess is a challenging game that can be a lot of fun once someone learns to play.
I think it may be “one is much longer and complex than the other”
Answer:
As soon as Shiro saw his master he ran to meet him, wagging his tail, and, seizing the end of his kimono, dragged him under a large yenoki tree. Here he began to dig very industriously with his paws, yelping with joy all the time. The old man, unable to understand what it all meant, stood looking on in bewilderment. But Shiro went on barking and digging with all his might.
Explanation:
I'm not too sure but the other parts in the story didn't seem like companionship to me, but in here the dog is helping the old man.
According to researchers...
because that means scientists have researched it
Answer: B) faces
Explanation: Pound is comparing "faces in the crowd" to petals that are laying against a tree branch.
Hope this helps!