Select the correct idiom that can substitute the highlighted group of words in the given sentence.
My mother ensures every corner of our home is clean and organised before my grandmother arrives.

Correct option is D

The correct substitution of the highlighted words is (d) spick and span.
Explanation: The phrase every corner of our home is clean and organised describes something that is spotlessly neat and tidy.
The idiom spick and span exactly conveys “immaculately clean and well-ordered.”
The other options do not express cleanliness: root and branch means “entirely/wholly,” a queer fish means “an odd person,” and a rainy day refers to “a time of need/emergency.”
Hence, spick and span is the most contextually accurate replacement.
Example: By the time guests arrived, the kitchen was spick and span.