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Hello,
The correct answer is C) 90 ft²
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Based on the information given the area of the isosceles trapezoid is 90 ft².
Area of isosceles trapezoid :
Using this formula
Area=1/2Ă—HeightĂ—Base of parallels
Let plug in the formula
Area=1/2Ă—6(12+18)
Area=3Ă—30
Area=90ft²
Inconclusion the area of the isosceles trapezoid is 90 ft².
Learn more about area of  isosceles trapezoid here:https://brainly.com/question/10187391