Marking a text with simple symbols as you read can help you: A. answer the question "Why am I reading?"
B. understand the meaning of unfamiliar words.
C. summarize a passage when you're done.
D. keep track of your reading experience.

Which statement best describes standard oil in the late 1800s? standard oil controlled only a small number of the nation’s oil refineries. standard oil was a single business that operated in a small region. standard oil controlled only the means and methods of oil production. standard oil owned ninety percent of all oil refineries in the united states.