Given the task definition and input, reply with output. In this task, you need to provide the correct option for a given problem from the provided options.

Problem: the dimensions of a field are 20 m by 10 m . a pit 8 m long , 5 m wide and 2 m deep is dug in one corner of the field and the earth removed has been evenly spread over the remaining area of the field . what will be the rise in the height of field as a result of this operation ? 
Options: ['a ) 1 m', 'b ) 2 m', 'c ) 0.5 m', 'd ) 0.75 m', 'e ) 1.5 m']

c