Explanation:

The definition provided, 'an electronic device that processes data and converts it into information,' perfectly describes a 'Computer'. Option (a) 'Computer' is the overarching term for such a device. Option (b) 'Processor' (CPU) is a critical component *within* a computer that performs the processing, but it is not the entire device itself. Options (c) 'Case' refers to the physical enclosure of a computer, and (d) 'Styles' is irrelevant in this context. Option (e) 'None of these' is incorrect because (a) precisely fits the definition.