Step 1: Understanding the Question:
The question requires matching commercially important Indian forest tree species with their respective botanical families. This is a fundamental skill in forest botany and silviculture.
Step 2: Detailed Explanation:
• Gmelina arborea (A): Commonly known as Gamhar or Sivan, it belongs to the Verbenaceae family (II) (though some modern classifications place it in Lamiaceae, in standard forestry exams, Verbenaceae is the traditional answer).
• Shorea robusta (B): The Sal tree is a flagship species of the Dipterocarpaceae family (V). The family name is derived from its "two-winged" fruits.
• Terminalia tomentosa (C): Also known as Terminalia alata or Sain/Asna, it belongs to the Combretaceae family (I). The genus Terminalia is characteristic of this family.
• Acacia catechu (D): Khair belongs to the Fabaceae family (III) (specifically the subfamily Mimosoideae). It is a nitrogen-fixing legume.
Step 3: Final Answer:
Matching the pairs: A-II, B-V, C-I, D-III. This sequence corresponds to option (A).