Answer: D. 4x+3y ≥ 11 
4x+3y ≤ 15 
X ≥0 
Y ≥0 
Explanation:
Let x = Number of pounds of licorice.
y= Number of pounds of jelly beans .
Given : The licorice costs $4 per pound, and the jelly beans cost $3 per pound. 
Cost of x licorice ( in dollars) = 4x
Cost of y jelly beans ( in dollars) = 3y
He will spend at least $11 but no more than $15. 
i.e. 


Here , 

It means the required system of inequalities models the situation are:


Here , 

Thus , the option D is the correct answer.