To find the direct object, find the subject "grandchildren," and the action verb "playing," then ask "whom or what" grandchildren are playing tag.
The answer is: B. tag
Feeling would be the one that makes the most sense.
The interaction creates a slow and quiet mood, which leaves a feeling of peace and calm in Scrooge
Restates the main idea and most important details.
The answer is I. When regarding yourself and another person you should always state it as "you and I" rather than "you and me".