In 1017, when Sultan Mahmud invaded Khwarizm, he took several scholars and poets back to his capital, Ghazni.
Al-Biruni was one of them.
He arrived in Ghazni as a hostage.
Al- Biruni's Kitab-ul-Hind, written in Arabic, is simple and lucid. Hence pair 1 is correct.
Ibn Battuta's book of travels, called Rihla, written in Arabic, provides extremely rich and interesting details about the social and cultural life in the subcontinent in the fourteenth century. Hence pair 3 is correct.
Firdausi was a Persian poet and the author of Shahnameh, which is one of the world's longest epic poems created by a single poet, and the national epic of Greater Iran. Hence pair 2 is not correct.