c is the answer to this question.
For a source of water for themselves and their crops.
Answer:
BC means year before jesus christ was born also known as 0
Explanation:
so if its 6 bc it means 6 years before 0 or 6 years before birth of jesus
suppose 100 bc then it means 100 years before 0 or 100 before birth of jesus christ
right now its 2020 AD or 2020 years after 0
