(A) "I went to the park to look for my lost briefcase" → (II) - "look for" means to search for something lost or missing.
(B) "The police will look into the cause of theft" → (IV) - "look into" means to investigate or examine something thoroughly.
(C) "She called her mother to look after her son" → (I) - "look after" means to take care of someone.
(D) "Kanta looked at the painting with a frown" → (III) - "looked at" means to observe or gaze at something (past tense required here).
Hence, Option 3: (A) - (II), (B) - (IV), (C) - (I), (D) - (III) → Each phrasal verb with "look" has a distinct meaning: "look for" (search), "look into" (investigate), "look after" (care for), and "looked at" (observe), which perfectly match the context of their respective sentences → correct