To know where you're going without losing track of where you go so you don't get lost and get killed.
The answer would most likely be: C
The government took most of the responsibility in the efforts to bring America out of depression with the "New Deal" Developed by Franklin D. Roosevelt.
I believe the answer is: cancer
According to research, about 60% of people who developed cancer got in when they hit the age of 60 or above.
The destruction of cells that happen in older people's body happen on a much higher rate compared to younger people but the regeneration is much slower. This plays a role in speeding up the growth of cancer.
This should be the answer you are looking for just make sure to reword it.