(A) - (II) "although" → Introduces a contrast clause (important job vs low pay); "although" is followed by a complete clause.
(B) - (IV) "in case" → Indicates a precautionary purpose (drew a map as a precaution in case she couldn't find it).
(C) - (I) "in spite of" → Shows contrast with a noun phrase; accepts job despite the low salary; requires a noun/noun phrase after it.
(D) - (III) "because of" → Indicates cause/reason with a noun; the noise was the reason for not sleeping; requires a noun after it.
Hence, Option 3: (A) - (II), (B) - (IV), (C) - (I), (D) - (III) → "Although" introduces clauses, "in case" shows precaution, "in spite of" shows contrast with nouns, and "because of" shows cause with nouns → correct