The common difference of the arithmetic sequence is 15.
The correct option is (a)
<h3>what is Arithmetic Sequence?</h3>
An arithmetic sequence (also known as an arithmetic progression) is a sequence of numbers in which the difference between consecutive terms is always the same. 
The arithmetic sequence is defined as
x:   1     2    3    4    5
y:  8   23   38  53  68
The common difference of the arithmetic sequence is

Let us take any two points: (1,8) and (2,23)
Then, d = 
           d= 15
Learn more Arithmetic sequence here:
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