चतुर्थक आर्थिक गतिविधियाँ (Quaternary activities) मुख्य रूप से निम्नलिखित में से किससे संबंधित हैं?

The arrival of which commission in India triggered widespread protests, including mass hartals across the country in 1928?

Which of the following leaders was instrumental in initiating and leading India’s struggle for independence?