Select the correct conclusion based on the meaning of the highlighted idiom:
The boy exulted in the success of his petty thefts but the Argus-eyed mother knew it all.
i. The boy was clever enough to take a little money at a time so that his mother never noticed it.
ii. The mother looked at her boy with such love and compassion that he regretted his actions.
iii. The mother was extremely vigilant and caught the boy red handed one day.
iv. The doting mother failed to see the faults of her boy and he became bolder in his acts.

Correct option is D

Option (d) is the correct meaning of the given idiom.
Idiom: Argus-eyed
Meaning: Extremely watchful or vigilant, like Argus of Greek mythology who had 100 eyes. (Hindi: बहुत सतर्क / चौकस)
Example: The Argus-eyed manager caught the employee stealing office supplies.
Other related idioms and meanings:
• Hawk-eyed – very observant
• Keep an eye on – to monitor closely
• Eagle-eyed – very sharp-sighted
All other options are incorrect as they imply negligence or affection, which contradicts the idiom’s core meaning.