Questions

Capital deepening is a situation where the capital per worker is increasing in the economy. This is also referred to as increase in the capital intensity. Capital deepening is often measured by the rate of change in capital stock per labour hour.

The error is in third part. Replace ‘good’ with ‘correct’. English is not good or bad, but it can be correct or incorrect. We can also say ‘All of them speak English well’, or ‘All of them speak fluent English’. The error remains in part c.

This can be interpreted from these lines of the passage, “Sanctions also play a dramatic role as an offensive militaristic manoeuver” and "Indeed, economics is often used directly as a weapon of war and conflict via trade sanctions."