'Cost an arm and a leg' means
ABe very expensive
BLose limbs in an accident
CBe very cheap
DBe free of cost
Answer & Solution
Correct answer: A. Be very expensive
1. Hyperbolic idiom for high price.
2. Limbs are figurative.
3. Cheap is the opposite.
4. Hence option A.
_Source: jkchrome.com SSC Idioms and Phrases PDF (Mistral OCR), section on common idioms_