I personally would say ancient castle in ruins...
My reason for this would be that the office building and the apartment in the city will be modern and won't have a Gothic feel to it...
The mansion in the countryside will be surrounded by green fields and well that scenario doesn't sound very dark and Gothic to me...
And well that castle in ruins will have a spooky side to it as it will be abandoned and especially at night will be a host to a whole range of spooky thoughts and ideas.
Answer:
b. Parallelogram.
Explanation:
A parallelogram is a four-sided mathematical figure with two sides parallel to each other. This simple quadrilateral also has two opposite sides of equal length and the interior opposite angles are of equal measures.
A parallelogram is also a type of polygon with four sides, much like a square, a rhombus, or a rectangle. All these geometrical figures are used in mathematical systems.
Thus, the correct answer is option b.