Help the dramatic meteorologist finish the weather forecast.

Whether we survive this weekend's catastrophic drizzle will depend entirely ___ how many umbrellas you own.

The correct answer is on.

In English, the verb "depend" is always followed by the preposition "on" (or "upon"). A common error for Slavic language speakers is to use "from" because of direct translation (e.g., Russian зависеть от, Polish zależeć od), but "depend from" is incorrect in English.