【单选题】

听力原文： [29] Many organizations around the United States hold canned food drives to help those in need. One Pennsylvania faith-based relief organization holds a drive with a twist: volunteers can the food themselves. Each winter, the Mennonite Central Committee sends a meat-canning truck on a tour of North America. The truck is equipped with industrial-size pressure cookers, and each community it visits mounts an all-out effort to can as much meat as possible before the truck moves on to the next stop. About 30 people crowd into a small barn on a farm just outside of Freeport, Illinois. [30] They work in shifts, from 5 in the morning until 10 at night. [29] Over the course of two days, they cook and can over 6,300 kilos of turkey meat to be sent to hungry people all over the world.

The news item mainly about
A．meat canning, a tradition in American church groups.
B．American church groups' canning food for those in need.
C．how to can food in American church groups.
D．die canned food delivery all over the world.