This question tests understanding of idiomatic expressions. 'It's raining cats and dogs' is an idiom meaning it's raining very heavily. Option B correctly captures the meaning of this common English expression. Options A, C, and D all incorrectly translate the idiom, with option A suggesting light rain, option C suggesting no rain, and option D suggesting a different weather condition altogether. The correct answer is therefore B. **Core Concept:** Understanding Idiomatic Expressions. **Solution Analysis:** We need to identify the meaning of the idiom 'it's raining cats and dogs', and pick the option that translates this to literal english. **Option Analysis:** - **A. It is slightly drizzling.:** This suggests light rain, the opposite of 'cats and dogs'. - **B. It is raining very heavily.:** This accurately translates the idiom. - **C. It is a sunny day.:** This is the opposite of a rainy day. - **D. It is snowing lightly.:** Incorrect, this suggest snow rather than rain. **Common Mistake:** Taking the idiom literally and interpreting it as actual animals falling from the sky instead of recognizing its figurative meaning.