Step 1: Understanding the Concept
The question asks for the alternative name for the Shiwalik (or Siwalik) ranges of the Himalayas.
Step 2: Defining the Himalayan Ranges
The Himalayas are divided into three major parallel ranges:
Greater Himalayas (or Himadri): The northernmost and highest range.
Middle Himalayas (or Lesser Himalayas or Himachal): The range located south of the Greater Himalayas.
Shiwalik Ranges (or Sub-Himalayas): The southernmost and lowest range, located at the foothills. Because of their position at the edge of the Himalayan system, they are also known as the Outer Himalayas.
Kunlun Slope: The Kunlun Mountains are a separate mountain range located to the north of the Tibetan Plateau.
Step 3: Final Answer
The Shiwalik ranges are the southernmost range of the Himalayas and are therefore also called the Outer Himalayas. Therefore, option (C) is the correct answer.