What are the different engine options available for the Audi A3 and how do they affect performance?

I am interested in buying an Audi A3 and I'm wondering about the available engine choices. What are the differences between them and how do they impact the overall performance of the car?

The Audi A3 has three engine options: a 2.0-litre turbocharged petrol engine, a 1.5-litre turbocharged petrol engine with mild hybrid technology, and a 2.0-litre turbocharged diesel engine. The larger engine sizes provide more power and higher top speeds, while the mild hybrid technology offers better fuel efficiency and lower emissions.