Why did Iltutmish refuse to help the Khwarezm prince?

To protect the infant Delhi Sultanate from a devastating invasion by the superior forces of Chengiz Khan.

Iltutmish, Taimur, and Vasco da Gama | History Timeline

Q: Consider the following statements: 1. It was during the reign of Iltutmish that Chengiz Khan reached the Indus in pursuit of the fugitive Khwarezm prince. 2. It was during the reign of Muhammad bin Tughluq that Taimur occupied Multan and crossed the Indus. 3. It was during the reign of Deva Raya II of Vijayanagara Empire that Vasco da Gama reached the coast of Kerala. Which of the statements given above is/are correct?

Only statement 1 is correct: Chengiz Khan reached the Indus during Iltutmish's reign (1221). Timur invaded in 1398 (not during MBT's reign), and Vasco da Gama arrived in 1498 (after Deva Raya II).

ID: HIS_MED_2021_05 Ref: Satish Chandra, Medieval India

Consider the following statements:
1. It was during the reign of Iltutmish that Chengiz Khan reached the Indus in pursuit of the fugitive Khwarezm prince.
2. It was during the reign of Muhammad bin Tughluq that Taimur occupied Multan and crossed the Indus.
3. It was during the reign of Deva Raya II of Vijayanagara Empire that Vasco da Gama reached the coast of Kerala.

Which of the statements given above is/are correct?