Answer:
1. C)
2. D)
Explanation:
We know that:
1/3 is afraid of spiders
1/12 fears spiders and snakes
Then, the proportion of children who fear spiders and also snakes is calculated as:

Option C)
Of the 1/3 of children who fear spiders, 1/4 of them also fear snakes.
Now:
1/2 is afraid of the serientes
1/12 fears spiders and snakes
Then, the proportion of children who fear spiders and also snakes is calculated as:

Option D)
Of the 1/2 of children who fear snakes, 1/6 of them also fear spiders