The most appropriate option for describing the number line you provided is:
1/6 + 2/6 + 2/6 = 5/6
This option reflects the movement from one-sixth (1/6) to three-sixths (3/6) (which is an increase of 2/6), and from three-sixths (3/6) to five-sixths (5/6) (which is an increase of 2/6). Thus, the calculation of moving from 1/6 to 5/6 is consistent with the progression shown on the number line.