Hajr (حجر‎) was old city which served as capital of Province “Al-Yamamah”, the modern name of this city is________?

A. Riyadh
B. Dammam
C. Abha
D. Al-Qatif

During the Pre-Islamic era the city at the site of modern Riyadh was called Hajr (Arabic: حجر‎), and was reportedly founded by the tribe of Banu Hanifa. Hajr served as the capital of the province of Al-Yamamah, whose governors were responsible for most of central and eastern Arabia during the Umayyad and Abbasid eras.