He knew it would cost lives and may cause battle
The best sentence starter would be number 1
Explanation:
I guess option C because of this
Economics is a social science which deals with the study of
how goods and services are produced, distributed, and consumed. It analyses how
people, enterprises, countries, and governments come up with options on how to
allocate resources so as to satisfy their
wants and needs effectively. It also tries
to assess how these parties are supposed to organize and manage efforts so as
to acquire maximum output