Which of the Following Is the Best Definition of a Spread

Which of the following is the best definition of a spread.

A) The gap between the interest rate a bank pays on deposits and the rate it charges on loans.
B) Statistical technique for distinguishing between two samples on the basis of their observed characteristics.
C) Design for inventory in which parts, raw materials, and other work-in-process are delivered exactly as needed for production. Goal is to minimize inventory.
D) Bill for goods or services provided by the seller to the purchaser.
E) The process of quantifying the probability of default when granting consumer credit.