Which figure has one-third of its whole shaded?
Option A:
2 out of 6 parts are shaded. Therefore, the fraction is 26 or 13
Option B:
9 out of 12 parts are shaded. Therefore, the fraction is 912 or 34
Option C:
3 out of 5 parts are shaded. Therefore, the fraction is 35
Option D:
1 out of 2 parts are shaded. Therefore, the fraction is 12