Explanation:
with 2 dice we have 6×6 = 36 possible outcomes.
you know
1, 1
1, 2
1, 3
...
6, 6
from these 36 possible outcomes only the following have a sum of 4 :
1, 3
2, 2
3, 1
so, 3 out of 36.
that mags the probability is
3/36 = 1/12
the first answer option is correct.