We've replaced all the school's reference books, so the library has a newer atlas that supersedes the one you were using.
Based on the context clues in the sentence, what is the definition of the word
supersede?
A. To be of exceptional quality
B. To complement
C. To be of lower quality
D. To take the place of

b. they require a huge investment of time, dedication ,training, and patience almost from the day they are born.

explanation:

the sentence gives a clear evidence of how carefully the sar dogs are selected and also specify from what time this exercise begins."almost from the day they are are born." this sentence shows as that this exercise begins early.

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