In the algebraic term, there are a number and a variable, the number is called the coefficient of the variable
EX: 2x is an algebraic term, where 2 is the coefficient of x
In the given polynomial
There are 4 algebraic terms
The coefficient of each term in the number before the variable
If there is no number that means the coefficient is 1
Since there is no number before x^3, then
Its coefficient is 1
The answer is D