**Quwwatul Islam Masjid in Delhi**

The correct answer to the question is option 'B' which states that Quwwatul Islam Masjid is in Delhi. Let's explore this further:

**Introduction to Quwwatul Islam Masjid:**

Quwwatul Islam Masjid, also known as the Qutub Mosque, is one of the oldest and most significant mosques in India. It is located in the Qutub Minar complex in Mehrauli, Delhi. The mosque holds great historical and architectural importance and attracts a large number of tourists and devotees.

**Historical Significance:**

- The construction of Quwwatul Islam Masjid began in the late 12th century, during the rule of Qutb-ud-din Aibak, the founder of the Delhi Sultanate.
- It was built using materials from demolished Hindu and Jain temples, including 27 Hindu and Jain temples.
- The mosque was initially built as a congregational mosque for Muslims, but it also served as a symbol of the victory of Islam over other religious communities.
- The mosque complex also includes the famous Qutub Minar, which was built later by Iltutmish, a successor of Qutb-ud-din Aibak.

**Architectural Features:**

- The Quwwatul Islam Masjid exhibits a unique blend of Hindu, Jain, and Islamic architectural styles.
- The mosque's facade is adorned with intricate carvings and inscriptions, showcasing the skill and craftsmanship of the artisans of that era.
- The most prominent feature of the mosque is the Iron Pillar, which stands in the courtyard. The pillar is famous for its rust-free iron composition and its inscription, which remains a mystery to this day.
- The prayer hall of the mosque is supported by a series of pillars, many of which have Hindu and Jain motifs engraved on them.

**Tourist Attraction:**

- Quwwatul Islam Masjid and the Qutub Minar complex are major tourist attractions in Delhi.
- The intricate carvings, architectural grandeur, and historical significance of the mosque make it a must-visit destination for history enthusiasts and architecture aficionados.
- The serene atmosphere and the spiritual significance of the mosque also draw devotees who come to offer prayers.

In conclusion, Quwwatul Islam Masjid, also known as the Qutub Mosque, is located in Delhi. It is an ancient mosque with historical and architectural significance, attracting tourists and devotees alike.