A Principal Merit of the GRP System Is That

A principal merit of the GRP system is that:

A) it provides a common base that proportionately accommodates markets of different sizes.
B) it provides a variable base that proportionately accommodates markets of all sizes.
C) it provides a common base that proportionately accommodates markets of all sizes.
D) it provides a variable base that proportionately accommodates markets of different sizes.
E) it commonly provides a variable base that proportionately accommodates markets of a precise side.