​Select the alternative which best expresses the meaning of the idioms/phrase. ​

Left no stone unturned

Correct option is B

Option (b) used all available means is the correct meaning of the given idiom.

Idiom: Left no stone unturned

Meaning: To try everything possible in order to achieve a goal or solve a problem. (हर संभव प्रयास करना)

Example:The detective left no stone unturned in his search for the missing child.

Related Idioms:

• Go the extra mile – To make an extra effort.
• Spare no effort – To try as hard as possible.

Meanings of other options:

• Did very irrelevant things (गलत) – The idiom means making every effort, not doing unrelated things.
• Took no pains (गलत) – Opposite in meaning; "took no pains" means making no effort.
• Resorted to illegitimate practices (गलत) – The idiom does not imply using unethical means.