There were many challenges that I faced during building this app:

1. I needed a lot of research in order to implement the option selecting feature i.e, when the user selects any option the border of that option turns purple, the main difficulty was that it is a textview so to change the background of multiple textview is difficult.
2. Another difficulty was to change the question as well as the image when the user moves to the next question. To tackle this I created an object class which contains all the details about the quiz questions and images and I accessed it with a for loop in the MainActivity.