Step 1: Understanding the Question:
This question tests knowledge of tree species tolerant to saline/sodic soils.
Step 2: Detailed Explanation:
Acacia nilotica (babul) is a tree species suitable for planting in saline/sodic soils.
It is highly tolerant to salt and alkaline conditions.
Toona ciliata (A): Not salt-tolerant.
Mangifera indica (C): Mango is not salt-tolerant.
Terminalia alata (D): Not salt-tolerant.
Thus, the correct answer is Acacia nilotica.
Step 3: Final Answer:
Thus, Acacia nilotica is suitable for saline/sodic soils, which corresponds to option (B).
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