Error spotting (prepositions of motion: in vs. into): Identify the erroneous segment (A/B/C) — choose D if there is no error — 'She walked in / the room where the murder / had taken place. / No error.'

Concept/Approach: Prepositions showing movement
Use into to show motion from outside to inside. 'Walked in the room' suggests 'walked inside the room' (already there). The intended meaning is entry.

Step-by-step correction
(A) 'She walked in' → 'She walked into'.Corrected sentence: 'She walked into the room where the murder had taken place.'

Common pitfalls
Confusing 'in' (location) with 'into' (motion toward the inside).

Final Answer
(A) is erroneous → use 'into' to show movement.