The Mozambique Channel lies between the island of Madagascar and the African mainland, particularly the coast of Mozambique. It is a water passage in the western Indian Ocean and is important for regional geography and shipping.
The other options refer to different bodies of water or geographic pairs: Indonesia and Malaysia are separated by other straits, Oman and Iran border the Strait of Hormuz, and India and Sri Lanka are separated by the Palk Strait and Gulf of Mannar. Thus Madagascar–Mozambique is the correct pair.
For exam preparation, retain the defining feature and connect it to the named place, process, or concept. Read each option precisely: similar geographic terms can refer to different locations or mechanisms. This distinction helps apply the fact correctly rather than relying on vague recall.

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