The answer is context clues. This is because you're using the clues from the other words (sentences/paragraphs) to answer the definition of the word.
Answer:
The mall was unusally hectic but it was the week before christmas
I like to drink milk or I like to eat cookies
I love to read so I go to the libray
A: a source that’s cited in another source
Answer:
People should be held accountable for life or death situations that they had substantial influence in or control over.
Explanation:
Your question is rather vague and not based upon any sort of book so I decided to give you a general statement --- heads start on your thesis. Life can be very surprising and sometimes events that happen are unstoppable. But clearly in every circumstance where an individual has affected something they should be held accountable for the outcome of their actions. Hope this helps.