Explanation:

The given sentence talks about the reason behind the choice made by the father for a particular school. The correct option to fill in the blank is 'made' which means that the father was the one who made the decision to choose that particular school. Let's understand this answer in detail.

Understanding the context:
The sentence talks about a decision that was made by the father for a particular school. It seems like the reason behind this decision is not clear to the speaker. Therefore, the blank needs to be filled with an appropriate verb that can specify the action taken by the father.

Options given:
a) happened - This option does not make sense in the given context as the decision was made by the father and not something that happened on its own.

b) controlled - This option does not fit in the context as well. The word 'controlled' suggests that the father had control over something related to the school, which is not mentioned in the sentence.

c) made - This option is the correct answer. The word 'made' refers to the action taken by the father, which was to choose that particular school.

d) asked - This option does not fit in the context. The father did not ask someone about the school, but he made a decision to choose that school.

e) thrilled - This option does not make sense in the given context. The word 'thrilled' means to be excited or happy, which does not fit in the context of the sentence.

Conclusion:
The correct answer to fill in the blank is option 'C' which is 'made'. This option is the most suitable verb that can be used in the given context as it refers to the action taken by the father to choose that particular school.