How does the strength of the reaction with water vary as you move down the group of alkali metals?​

All the alkali metals react vigorously with cold water. In each reaction, hydrogen gas is given off and the metal hydroxide is produced. The speed and violence of the reaction increases as you go down the group. This shows that the reactivity of the alkali metals increases as you go down Group 1.:

i would say b

explanation:

but i think i would need more information than that