Step 1: Understanding the Question:
The question asks to identify which plant among the given scientific names is primarily grown for fiber production.
Step 2: Detailed Explanation:
• Triticum aestivum (A): This is common Bread Wheat. It is a cereal crop grown for its energy-rich grains used to produce flour.
• Gossypium hirsutum (B): This is Upland Cotton. Cotton is the world's most important natural fiber-yielding plant. The fibers are unicellular hairs (lint) that grow on the seed coat.
• Lens culinaris (C): This is the Lentil (Masoor). It is a pulse crop grown for its seeds, which are high in protein.
• Glycine max (D): This is the Soybean. It is a dual-purpose crop grown for both oil and high-quality vegetable protein (pulse/oilseed).
Final Answer:
Among the options, only cotton (Gossypium hirsutum) is a fiber crop.
Therefore, the correct answer is option (B).