According to the above sentences, the flying buttress include option A: An architectural structure used to provide horizontal strength to a wall.
A flying buttress is generally defined as the mode of buttress that is helpful to supports a building from one side to the another side.
The main purpose of this buttress is to strengthen the building or to resist the side thrust that is created by the load.
It is an important element of Gothic architecture the stained glass windows provided illuminated, multicolored interiors that brought a feeling of lightness.
Therefore, correct option is A.
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