What is a groin vault? a. A groin vault is a structure that resembles the top half of a sphere. b. A groin vault comes from the extension of a round arch, similar to a long tube of arches. c. A groin vault has two barrel vaults of the same diameter which cross or intersect one another. d. A groin vault has two barrels which extrude into a two dimensional structure.

A. a groin vault has two barrel vaults of the same diameter which cross or intersect one another.

Explanation:

Groin vault. A groin (or cross) vault is formed by the perpendicular intersection of two barrel vaults. A rib (or ribbed) vault is supported by a series of arched diagonal ribs that divide the vault's surface into panels. A fan vault is composed of concave sections with ribs spreading out like a fan

A. a groin vault has two barrel vaults of the same diameter which cross or intersect one another.

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the previous answer given.