The correct answer is option D, which includes all the sites/monuments mentioned in the question. Let's discuss each of them in detail:

1. Champaner-Pavagadh Archaeological Park:
Champaner-Pavagadh Archaeological Park is located in Gujarat, India. It is a UNESCO World Heritage Site that includes the remains of the ancient city of Champaner and the nearby Pavagadh Hill. The park showcases a unique blend of Hindu and Islamic architectural styles and spans an area of about 1,329 hectares. It is renowned for its well-preserved monuments, including temples, mosques, tombs, fortifications, and other structures.

2. Chhatrapati Shivaji Railway Station, Mumbai:
Chhatrapati Shivaji Railway Station, formerly known as Victoria Terminus, is a historic railway station located in Mumbai, Maharashtra, India. It is considered one of the finest examples of Victorian Gothic architecture in the country. The station was built in 1887 and serves as a major transportation hub in Mumbai. The intricate design, ornamental details, and grandeur of this iconic building make it a UNESCO World Heritage Site.

3. Mahabalipuram (also known as Mahallapuram):
Mahabalipuram is a famous coastal town situated in the state of Tamil Nadu, India. It is renowned for its group of monuments and rock-cut temples, which were built during the Pallava dynasty in the 7th and 8th centuries. The monuments include temples, cave sanctuaries, monolithic rathas (chariots), and bas-reliefs. The town's rich cultural heritage, historical significance, and architectural brilliance have earned it a place on the UNESCO World Heritage List.

4. Sun Temple (Konark Temple):
The Sun Temple, also known as the Konark Temple, is a colossal temple dedicated to the Sun God located in Konark, Odisha, India. Built in the 13th century, it is a magnificent example of Kalinga architecture. The temple is designed in the shape of a majestic chariot with intricately carved stone wheels, pillars, and walls. The entire temple complex is richly decorated with sculptures depicting various aspects of Hindu mythology. The Sun Temple is recognized as a UNESCO World Heritage Site.

In conclusion, all the mentioned sites/monuments, namely Champaner-Pavagadh Archaeological Park, Chhatrapati Shivaji Railway Station, Mahallapuram, and Sun Temple (Konark Temple) are included in the World Heritage List of UNESCO. These sites have significant historical, cultural, and architectural value, making them important landmarks in India.