Help! What is equivalent to the expression 6(21)

A. 6(21-1)
B. 6(20 + 1)
C. 6(20-1)
D. (3+2)(21+1)
E. (3+2)(20+1)

B is the correct answer
Anything within parenthesis completed first. So 6(20+1) is equal to 6(21).
A isn’t right because 21-1=20. 6(20) is not equal to 6(21)
C isn’t right because 20-1=19. 6(19) and 6(21) aren’t equal.
E and D aren’t right because 3+2=5. 5(22) and 5(21) are not equal to 6(21).
Hope this helped!!