Final answer:
The product of the ones digits 1 and 2 is 2. This multiplication of ones digits is a basic concept in arithmetic, part of the mathematics subject for middle school students.
Step-by-step explanation:
The student is asking about the product of the ones digits in a multiplication question. Multiplication is a basic mathematical operation where two numbers (called factors) are combined to get a product, which is the total amount. When you multiply the ones digits 1 and 2, you simply multiply 1 by 2, resulting in 2 as the product. Therefore, the correct answer is B. 2.