What is Roli attempting to help Merci understand

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.

if you need any clarification or more explanation pls do mention in the comment section.

      hope this and if it does pls mark as branliest answer thx

the answer should be

the simple past tense of strive.

hope this !