An author’s is his or her reason for writing a text.

1. idea
2. assumption
3. belief
4. purpose

Purpose

Explanation:

An author's purpose is his or her reason for writing a text. Sometimes this purpose is explicitly stated in the text, while other times the reader has to guess it. However, all authors have a purpose when they write. Knowing the author's purpose can help us better understand a text. It can help us understand why the author chose a particular topic, particular words or a certain tone. It can also help us place the text within its larger context.

4. Purpose

An author's purpose is his or her reason for writing a text.

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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can you show me the drop down menu? ill answer it after you've done that. ill edit this i mean promise

explanation: