Correct option is C
The correct meaning of the idiom
“ABC” is
(c) Very common knowledge.
Meaning of Idiom: Basic or elementary knowledge; things that are easy and known by everyone
Hindi: प्रारंभिक जानकारी, सामान्य ज्ञान ✅
Example:
The rules of grammar are the ABCs of writing.
Related idioms:
·
Know something inside out: To know something thoroughly.
·
Easy as pie: Very easy.
Meanings of all other given options:
·
Fair and honest: न्यायसंगत और ईमानदार ❌
·
To be ready: तैयार होना ❌
·
Complete failure: पूरी तरह असफलता ❌