What makes arches and domes more stable than flat roofed structures?

W) They transmit compressive forces along their length to the ground, uniformly bearing the load of gravity

X) Each section is under great tension, using the stronger dimension of the components

Y) Torsional resistance to sideways swaying ensures that such structures are stable, even in high winds

Z) The surface tension of the arched shape allows the building components to be hollowed out, saving weight.
W) THEY TRANSMIT COMPRESSIVE FORCES ALONG THEIR LENGTH TO THE GROUND, UNIFORMLY BEARING THE LOAD OF GRAVITY