If \[\mathbf{m}\text{ }=\text{ }\left( -\text{ }\mathbf{28} \right)\text{ }+\text{ }\mathbf{26}\text{ }+\text{ }\left( -\text{ }\mathbf{28} \right)\text{ }+\text{ }\mathbf{26}\text{ }+\text{ }\_\_\_\_\] \[\left( \mathbf{40}\text{ }\mathbf{terms} \right)\text{ }\mathbf{and}\text{ }\mathbf{n}\text{ }=\text{ }\mathbf{39}\text{ }+\text{ }\left( -\text{ }\mathbf{35} \right)\text{ }+\text{ }\mathbf{39}\text{ }+\] \[\left( -\text{ }\mathbf{35} \right)\text{ }+\_\_\_\_\_\_\text{ }\left( \mathbf{40}\text{ }\mathbf{terms} \right)\] then m-n is equal to.

• A. -120   
• B. 40  
• C. -40 
• D. 120
• E. None of these