Open this page to read a passage and study a diagram from Into the Unknown. Think about how the text and graphic work together.

What information does the diagram add to help you understand why the ship had problems?

A. The engine is powered by steam, which is created when wood burned in the furnace heats water in the boiler and turns it to steam.
B. The boiler consumed a lot of wood, but the steam engine was not powerful enough.
C. The steam dome, boiler tubes, and steam pipe are all parts that power a steam engine.
D. The design faults prevented the engine from creating enough steam for the day.