In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: what is the maximum number of pieces that a circular pizza can be cut into with 6 linear cuts ?
Options: ['a ) 12', 'b ) 13', 'c ) 16', 'd ) 20', 'e ) 22']
e