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McClure Sisters Inc., an architectural firm, is in the early phases of planning the building for the Sports and Leisure Museum. The museum will be twice as long as it is wide to accommodate the exhibit hall for sports and the exhibit hall for leisure. The museum will also have a $15$-foot-wide parking lot along two sides.$\newline$The total area of the museum and parking lot together in square feet can be modeled by the expression $(2x + 15)(x + 15)$, where $x$ is the width of the museum in feet. This expression can also be written in the form $2x^2 + 45x + 225$. What does the quantity $45x + 225$ represent in the expression?$\newline$Choices:$\newline$(A)the area of the museum in square feet$\newline$(B)the length of the museum and parking lot together in feet$\newline$(C)the perimeter around the outside of the museum and parking lot in feet$\newline$(D)the area of the parking lot in square feet