Jenn draws a scalene triangle, and measures the heights from each of the vertices to its opposite side. She discovers that the three height lengths are all roots of the polynomial x3−3.9x2+4.4x−1.2. What is the length of the inradius of the triangle?<spanclass=′latex−bold′>(A)</span>133<spanclass=′latex−bold′>(B)</span>113<spanclass=′latex−bold′>(C)</span>72<spanclass=′latex−bold′>(D)</span>158<spanclass=′latex−bold′>(E)</span>149