Incorrect Robn56.  Airbus has the A318, which can accomodate about 105 to 132 passengers. the C series can accomodate 108 to 160 passengers (CS100 seat 108-133, CS200 seats up to 160).  They are in the very same category.  You are thinking of Boeing who don't have a plane in this category.  I think it is a reasonably sure thing that Airbus will do its best to bury the C series.