Task: Question Answering
Input (English): Problem: in the figure given below, abc and cde are two identical semi - circles of radius 2 units. b and d are the mid points of the arc abc and cde respectively. what is the area of the shaded region ?
Options: ['a. 4 π - 1', 'b. 3 π - 1', 'c. 2 π - 4', 'd. ½ ( 3 π - 1 )', 'e. 2 π - 2']
Output (English): c