The answer is A.
to solve this use the equation lp/2+B.
first replace the l with 3.5, the slant height. then find the perimeter of the base (p) by multiplying 4.5 by 3.
Divide all of that by 2 then add 8.78 (The area of the base [calculated by dividing 4.5 by 2 then multiplying that by 3.9])