The Following Problem Requires the Data Shown Below for a Large

The following problem requires the data shown below for a large firm (Pfizer) and a smaller firm (Immunogen) in the Chemicals & Allied Products industry:
$\begin{array}{lrrrrrrrrr}&\text {No. }&&&&&&&\text { Values}&\text {(\$mn.) }\\&\text { Bus.}&\text { ..Values}&\text { (s mn.) }&\text {at } \mathrm{Y-E}-&\text { 1999.. }&\text { 1999 Values}&(\$ \text { mn.) }&\text { at Year-End }& 2000\\\text { Company }&\text {Seg.}&\text { PP\&E }&\text {TA}&\text { Debt}&\text { BEQ}&\text { Sales}&\text { Net.Inc. }&\text {BEQ}&\text { MEQ }\\\hline \text { PFIZER } & 3 & 5,343 & 20,574 & 5,526 & 8,887 & 29,574 & 3,718 & 16,076 & 290,216 \\\text { IMMUNOGEN } & 1 & 158 & 7,17 & 0.07 & 5.3 & 11.18 & -0.24 & 154 & 822.3\end{array}$
-Which of the following factors most likely explains the difference in the profitabilities of these two firms?

A) differential ability to secure debt financing
B) differential economies of scale
C) the difference in the number of business segments