Explanation: To understand the context of the statements, we need to delve into the geography, culture, and history of Punjab and Sindh.
**Geography of Punjab and Sindh:**
Punjab and Sindh are two provinces located in the Indus River plain, which is a vast alluvial plain formed by the Indus River and its tributaries. This region is characterized by low-lying areas, which are generally flat and fertile. The Indus River plain is one of the most important agricultural regions in South Asia, supporting a significant portion of the population with its rich soil and irrigation systems. Therefore, the statement that the provinces of Sindh and Punjab are on lowlands is true.
**Cultural Attire:**
The salwar kameez is a traditional dress worn in many parts of South Asia, including Punjab. The salwar is a pair of loose trousers that are wide at the top and narrow at the ankles, often paired with a kameez, which is a long shirt or tunic. This attire is comfortable and suitable for the warm climate of the region. The salwar kameez is not only a traditional dress but also a symbol of cultural identity in Punjab. Hence, the statement that the salwar of the Punjabi suit is a pair of loose trousers is true.
**Historical Ruler:**
Maharaja Ranjit Singh was a prominent ruler of the Punjab region in the early 19th century. He founded the Sikh Empire, which at its peak extended from the Khyber Pass in the west to the borders of Tibet in the east, and from Kashmir in the north to the Sutlej River in the south. Ranjit Singh was known for his military prowess and his ability to maintain a multi-ethnic and multi-religious empire. He is often referred to as the "Lion of Punjab" due to his significant contributions to the region. Therefore, the statement that Maharaja Ranjit Singh was the ruler of Punjab is true.
In conclusion, all three statements are true, making option C the correct answer. Understanding the geography, cultural attire, and historical context of Punjab and Sindh is essential to comprehending the significance of these statements.