Answer : 1. "Memo line"
Explanation :

Answer: A) Memo line Explanation: The parts of a check are :   1. Name & Address 2. Date 3. Pay to the order of 4. Written amount 5. Numeric amount box 6. For or Memo line  7. Signature line 8. Check number 9. Account number 10. Bank name etc...    Hence, the Memo line which describes the purpose of the check is of least important in all the parts of a check.