provide additional support in the construction of gothic structures.

Barrel vaults
Flying buttresses
Wood frames
Round arches

Need the reasons to solve 

Heyaas we all know that history is the most important without it we cant solve anything. i had never read any history thats why i dunno know about any past culture.we can read it via wikipedia. u

List the choices below and i’ll u : d

The answer is (aba)