Cartographers can represent the spherical earth on flat paper by making a(n)
which is like casting shadows from the spherical world onto a flat piece
of paper
a. unwarping
b. projection
c. flattening
d. peel

Cartographers can represent the spherical Earth on flat paper by making a projection which is like casting shadows from the spherical world onto a flat piece of paper

Explanation:

Cartographers otherwise known as map makers who combine nature and science through an acquired skill called cartography, it could serve as an efficient form of communicative technique for acquiring information through the procession of data.

Cartographers use PROJECTION to represent the spherical earth on a flat paper, through this scientific method, one could say that this structure reshapes reality in the human eye. There are steps or ways in which one can achieve a representation of the spherical earth on flat paper but it can only be foreseen by the complementarity of PROJECTION.

b is the right answer for this question.