To solve this question, we need to identify the alloy made from Copper (Cu), Manganese (Mn), and Nickel (Ni).
1. Understanding the Options:
- Magnesium: A pure element, not an alloy.
- Magnet: A general term for materials with magnetic properties, not a specific alloy.
- Manganin: An alloy of Cu (Copper), Mn (Manganese), and Ni (Nickel), used in electrical resistance applications.
- Magma: Molten rock beneath Earth's surface, not an alloy.
2. Identifying the Correct Answer:
The alloy formed from Cu, Mn, and Ni is known as Manganin.
Final Answer:
Option (C) Manganin is correct.