A) Road development made canals obsolete and rarely used.
The first one is true, the second one is true, the third one is false, and the fourth one is false
Think about it, who has more opportunities to find a good job? Someone who can read and write well, or someone who doesn't know how to read and write well? The correlation between literacy levels and standard of living is very strong. The more education an individual has, the more opportunities they may have to better their life.
Therefore, your best answer is "<span>When one social condition rises or falls, so does the other. Literacy rates are positively correlated with standard of living."</span>
1. Qutb al-Din Aibak, a former Turkic Mamluk slave of Muhammad Ghori, was the first sultan of Delhi, and his Mamluk dynasty conquered large areas of northern India. Afterwards, the Khalji dynasty was also able to conquer most of central India, but both failed to conquer the whole of the Indian subcontinent.
2. Revolts against Muhammad bin Tughlaq began in 1327, continued over his reign, and over time the geographical reach of the Sultanate shrunk. The Vijayanagara Empire originated in southern India as a direct response to attacks from the Delhi Sultanate., and liberated south India from the Delhi Sultanate's rule
