Correct option is D
Lapping is a precision finishing process used to achieve smooth surfaces and tight tolerances. The most commonly used abrasive for lapping soft ferrous and non-ferrous metals is Aluminium Oxide (Al₂O₃) because:
· It has moderate hardness and is not too aggressive, making it ideal for soft metals.
· It provides a uniform finish with minimal material removal.
· It is commonly used in lapping, polishing, and grinding applications.
