Read this excerpt from Susan Butcher and the Iditarod Trail.

At the hospital in Anchorage on January 27, doctors carefully packed the vials of serum. They wrapped them in several layers of quilting and then canvas to protect them against breakage and cold. They included written instructions on how to warm the serum along the route. This compact, twenty-pound package could make the difference between life and death for children one thousand miles away.

Which conclusion can be formed based on the information in the excerpt?

A) Serum packages are heavy and bulky.
B) Serum can be damaged by low temperatures.
C) Serum is not sensitive to temperature changes.
D) Serum is easily transported over long distances.