A. (5, 6)
E. (9, 18)
F. (10, 21)
Let's continue the pattern of +1 to the X value and +3 to the Y value for each point.
(4+1, 3+3) = (5, 6) which matches option "A".
(5+1, 6+3) = (6, 9) which doesn't match anything.
(6+1, 9+3) = (7,12) which doesn't match anything.
(7+1, 12+3) = (8,15) which doesn't match anything.
(8+1, 15+3) = (9, 18) which matches option "E"
(9+1, 18+3) = (10,21) which matches option "F"
And since there's no options with an X value greater than 10, we can stop.