Topic: Adjective (বিশেষণ),

Best Answer Explained in Below-:

In the statement "Steel is __ but wood is soft," we need to compare the hardness of steel and wood. The correct answer is "D) hard," as it accurately reflects the intrinsic properties of these two materials.

Steel is an alloy primarily composed of iron, which undergoes specific processing to enhance its strength and hardness. It is known for its durability and ability to withstand significant stress and force without deforming, making it a preferred material for construction, tools, and machinery. In contrast, wood, while versatile and aesthetically pleasing, is relatively softer and more susceptible to wear, dents, and environmental changes.

The word "hard" establishes a clear contrast with "soft," emphasizing the significant difference in physical characteristics. Options like "soft," "tougher," and "softer" either do not fit grammatically in the context of the sentence or fail to represent steel's comparative hardness accurately. Thus, "hard" effectively completes the comparison, illustrating the fundamental difference between steel and wood.