Step 1: Understanding the objective of control. 
  
The primary objective of control is to ensure that the actual performance aligns with the planned performance. When deviations occur, the objective is to rectify these deviations by taking corrective actions. This rectification process ensures that goals are met and the organization functions as intended. 
Step 2: Analyzing the options. 
  
(A) Variation: Incorrect. While variation is part of the control process, the main objective is not to create variation but to correct it when it arises. 
  
(B) Deviation: Incorrect. Deviation refers to the differences between planned and actual performance, but the main goal of control is to rectify such deviations. 
  
(C) Rectification: Correct. The primary goal of control is to correct deviations and bring performance in line with the plans. Rectification ensures that objectives are achieved. 
  
(D) None of these: Incorrect. The correct answer is (C). 
Step 3: Conclusion. 
  
The main objective of control is rectification, to ensure that deviations are corrected and the organization’s performance aligns with its goals. Thus, the correct answer is (C).