Option a is the correct answer. Quwwat-ul-Islam Mosque stands in Delhi, while Arhai Din Ka Jhonpra is situated in Ajmer. The Quwwat-ul-Islam Mosque in Delhi (built 11921316) was sponsored by Qutb-ud-din Aibak, founder of the Mamluk dynasty. It's famed for its victory tower, commemorating Muslim conquest. Once a HinduJain temple, it was transformed into the mosque. The Qūwat-ul-Islām mosque (completed 1196), crafted from demolished temples, comprises red sandstone, gray quartz, and white marble. Adhai Din Ka Jhonpra, a historic mosque in Ajmer, India, is among the country's oldest. Commissioned by Qutb-ud-Din-Aibak in 1192 CE and designed by Abu Bakr of Herat, it showcases early Indo-Islamic architecture. Iltutmish's enhancements followed in 1213 CE. Built mostly by Hindu masons under Afghan supervisors, the mosque maintains original Indian elements, including ornate pillars.