The correct answer is: A. Accumulator.
An accumulator is a numeric variable used for accumulating something. It is a variable that is used to keep track of a running total. For example, you could use an accumulator to keep track of the number of times a user has clicked on a button.
A counter is a numeric variable that is used to count something. It is a variable that is used to keep track of the number of times something has happened. For example, you could use a counter to keep track of the number of times a user has logged in to a website.
A positive number is a number greater than zero. For example, 1, 2, 3, and 4 are all positive numbers.
A negative number is a number less than zero. For example, -1, -2, -3, and -4 are all negative numbers.