If \[{{I}_{1}}\] and \[{{I}_{2}}\] be the size of the images respectively for the two positions of lens in the displacement method, then the size of the object is given by [CPMT 1988]

• A.            \[{{I}_{1}}/{{I}_{2}}\]        
• B.            \[{{I}_{1}}\times {{I}_{2}}\]
• C.            \[\sqrt{{{I}_{1}}\times {{I}_{2}}}\]                                  
• D.            \[\sqrt{{{I}_{1}}/{{I}_{2}}}\]