Answer:
Your answer would be "driving".
Step-by-step explanation:
The word in the sentence that is a gerund is "driving". Gerunds are words that are formed with verbs but act as nouns. They are easy to identify because they are a verb+ing acting as a noun. What is more, as they act as nouns, they can be subjects, direct objects, indirect objects, objects of prepositions, and predicate nouns. In the sentence above, the gerund is acting as the subject of the sentence. The complete subject is therefore the NP "driving to the game".