Problem: Determine the topic of the passage. "Black Friday is the day following Thanksgiving Day in the United States , often regarded as the beginning of the Christmas shopping season." Topic:

A: Black Friday (shopping)

Problem: Determine the topic of the passage. "It is available as a commercial product in many countries, with similar variations in ingredients, cooking method, and other variables." Topic:

A: Potato bread

Problem: Determine the topic of the passage. "Its basic function is to transport water, but it also transports some nutrients through the plant." Topic:

A: Xylem

Problem: Determine the topic of the passage. "The Lend Lease act was an act where the United States had supported its allies." Topic:

A:
Lend-Lease