I say it's B but I might be wrong
1.sleeping
2.to introduce
3.finishing
4.eating
5.arguing
6.to inform
7.to lock
8.meeting
9.skiing
10.to post
11.reading
12.forgetting
13.to say
15.to climb
16.losing
17.to buy
18.watching
19.to pick up
20.smoking
21.complaining,solving
B. Context clues. All the other things can help you find the meaning of an unknown word, but the details of a sentence or paragraph is the context.
The correct answer would be b
The symbol that is described in the excerpt is D. the casket, and it symbolizes the loss of Doodle.