Answer:
b .The type of force that water striders use is stronger than the type of force that geckos use.
Explanation:
Geckos and water striders use attractive forces for stick to glass and to walk on water, respectively. The glass is a nonpolar substance, and it's possible that in geckos paws there are nonpolar substances, so the force between them is London's forces.
The water is a polar compound, and the water strides make dipole-dipole forces to walk on water, because in its pawns that are polar molecules too.
Dipole-dipole force is stronger than London's forces because the polar substances are more attracted between them (electrostatic attraction).
