Answer:
1 - I look forward to learning to drive.
Step-by-step explanation:
The infinitive is the base form of a verb. It usually consists of the infinitive marker to and the verb itself (e.g. to read, to run).
The infinitive is present in all sentences (to drive, to change, to go, to surrender), but in the first one, we have another type of to (I look forward to...). Here, it is a preposition that is a part of the phrasal verb to look forward to.
Phrasal verbs are phrases that consist of a verb and another element - an adverb, proposition, or both. Look is a verb, forward is an adverb, and to is a preposition.
This is why the first option is the correct one.