a.) 1.
The fast-growing online Indian viewer base
Increased international interest (people from outside of India)
2. The company spent 35 billion on launching 4G network. Next to that, more people started using phones. As a result, more people started using T-series to watch videos.
b.) I think it's wonderful that people in India can watch their favourite Bollywood movie whenever they want.
c.) The world is becoming smaller. For instance, nowadays planes are getting more advanced so you can travel to countries faster (use of internet).