How many bits make one nibble?

The correct answer is B, 4. A bit, short for binary digit, is a single 0 or 1 and is the smallest unit of data a computer handles. Four bits together are called a nibble, which is exactly half of a byte, and the playful name comes from a nibble being a small bite. The nibble matters in practice because one hexadecimal digit is stored in exactly four bits, which is why hexadecimal is such a convenient shorthand for binary. Option A is wrong because two bits form no named unit and can represent only four combinations. Option C is wrong because eight bits make one byte, the unit in which a single character is normally stored. Option D is wrong because sixteen bits make two bytes, often called a word on older machines. Remember the ladder: bit, nibble of 4 bits, byte of 8 bits.