What is the primary reason solids are far less compressible than gases?
The tight coupling between neighboring atoms in solids results in a much higher resistance to volume change compared to gases, where molecules are weakly coupled. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Tight coupling between neighboring atoms. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.
Ref: NCBI Bookshelf, Ideal Gas Law: P1V1/T1 = P2V2/T2.