Answer:

In the International System of Numeration, commas are used to separate groups of three digits to make large numbers easier to read and understand. Each group of three digits is called a period.

The given number, 8945673, can be written in the International System of Numeration as follows:

(a) 8,945,673
This is the correct representation of the number using commas. The number is divided into three groups: 8, 945, and 673. Each group is separated by a comma, making it easier to read and comprehend the magnitude of the number.

(b) ,945,673
This representation is incorrect because the first group of three digits is missing. In the International System of Numeration, the first group should always contain three digits. Therefore, this option is not the correct way to represent the number.

(c) 8,945673
This representation is incorrect because there is no comma to separate the second and third groups. In the International System of Numeration, each group of three digits should be separated by a comma. Therefore, this option is not the correct way to represent the number.

(d) 8945673
This representation is incorrect because there are no commas to separate the groups of three digits. In the International System of Numeration, commas are used to separate the periods. Therefore, this option is not the correct way to represent the number.

Conclusion:

The correct representation of the number 8945673 using commas in the International System of Numeration is (a) 8,945,673. This representation follows the rules of separating the number into groups of three digits with commas.

In my sugesstion the c is correct