The correct answer is option 'D', the Lodis.

The Rajasthani-Gujarati style of architecture is known for its distinct features such as balconies, kiosks, and caves. These architectural elements were commonly used in the construction of buildings during the reign of the Lodis in India.

The Lodis were a dynasty that ruled over Delhi and parts of northern India from 1451 to 1526. They were of Afghan origin and their rule marked a period of relative stability and prosperity in the region. During their reign, several architectural marvels were constructed, showcasing the unique blend of Rajasthani and Gujarati styles.

Below are the key points explaining the use of balconies, kiosks, and caves in the architecture of the Lodis:

1. Balconies:
- Balconies are platforms projecting from the wall of a building, supported by columns or console brackets.
- They serve both functional and aesthetic purposes, providing a space for people to stand or sit while also adding to the visual appeal of the building.
- Balconies in Rajasthani-Gujarati style architecture are often intricately carved and decorated, exhibiting exquisite craftsmanship.
- These balconies are commonly found in palaces, forts, and havelis (traditional Indian mansions) built during the Lodi period.

2. Kiosks:
- Kiosks are small, open structures that are usually used for selling goods or providing information.
- In the Rajasthani-Gujarati style, kiosks are often incorporated into the architecture of buildings, especially in the form of small pavilions or canopies.
- These kiosks are typically adorned with intricate carvings and serve as decorative elements in the overall design of the building.
- They may also provide shade or shelter to people passing by or engaging in activities around the building.

3. Caves:
- Caves are natural or artificially constructed hollow spaces that are often used as dwellings, places of worship, or for other purposes.
- In the Rajasthani-Gujarati style architecture, caves are sometimes incorporated into the design of buildings, especially in temples and religious structures.
- These caves may serve as sanctuaries, meditation chambers, or areas for religious rituals.
- They are often adorned with sculptures, paintings, or inscriptions depicting religious or mythological themes.

In conclusion, the use of balconies, kiosks, and caves in the Rajasthani-Gujarati style of architecture is a characteristic feature of the buildings constructed during the reign of the Lodis. These elements not only add to the aesthetic appeal of the structures but also serve functional purposes, showcasing the architectural brilliance of the era.