The correct option is C I ate ice cream
The conditional clause or the antecedent is whenever I go to Indira Nagar (even though it has been mentioned later, it is the conditional clause).
The result or the consequent is that I eat ice cream.
Here, the statement affirms that I went to Indira Nagar. So, the condition has been fulfilled. Thus, we can conclude that the result had happened.
Hence, the correct answer is option A.