Determine the common ratio and find the next three terms of the geometric sequence. 2/9, 2/3, 2,  ...
a. 3; 3/2, 9/2, 21/2
c. 1/3; 3/2, 9/2, 21/2
b. 3; 6, 18, 54
d. 1/3; 6, 18, 54