The correct option is C Venomous snakes
When the ventral or belly scales are small and continuous with the dorsal scales i.e., no difference between the dorsal and ventral scales, the snake is non-poisonous.
When the ventral scales are broad but do not cover the belly completely, it is a non-poisonous land snake.
When the ventral or belly scales are broad and run completely across the belly, it may be a poisonous snake.
So, the correct answer is option B.