Which bash command will print all lines from the “colors.txt” file containing the non case-sensitive pattern “Yellow”?

Which bash command will print all lines from the “colors.txt” file containing the non case-sensitive pattern “Yellow”?
A . grep -i “yellow” colors.txt
B . locate “yellow” colors.txt
C . locate -i “Yellow” colors.txt
D . grep “Yellow” colors.txt

Answer: A