Two blocks of masses \[{{m}_{1}}\] and\[{{m}_{2}}\] are placed in contact with each other on a horizontal platform. The coefficient of friction between the platform and the two blocks is the same. The platform moves with an acceleration. The force of interaction between the blocks is

• A. zero, only if \[{{m}_{1}}={{m}_{2}}\]
• B. non-zero, when \[{{m}_{1}}>{{m}_{2}}\]
• C. non-zero, when \[{{m}_{1}}<{{m}_{2}}\]
• D. zero in all cases