What does an author use to create tone or mood in a story?
a) punctuation and grammar
b) the artist previous works
c)the detail of the main plot events
d) vocabulary and diction

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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explanation: