Find the Matching Number from Among the Choices Listed at Bottom

Find the matching number from among the choices listed at bottom. Use none more than once, and be aware that there are more choices than you will use.
-___ the Chicago Attitude

A) environmentalist
B) Frankenstein
C) Native Americans
D) daemon
E) Al Gore
F) Heart of Darkness
G) deism
H) Romanticism
I) naturalist
J) William Wordsworth
K) Henry David Thoreau
L) annexation of Texas
M) Ralph Waldo Emerson
N) The Tempest
O) Carl Sandburg