Explanation:

A laptop is designed for portability and personal use. Its defining characteristics are its compact size, light weight, and integrated components (screen, keyboard, touchpad) that allow it to be easily transported and used in various locations. Option (c) 'Small, light weight computer which fits in a suitcase' perfectly encapsulates these features. Option (a) 'Computer used in clinical laboratory' describes a potential application but not the inherent nature of a laptop; other computer types can also be used there. Option (b) 'Computer made ley compact' is grammatically incorrect and vague. Therefore, the most accurate definition of a laptop is its portability and form factor ($ \text{c} $).