How did the banking industry prove to be a profitable connection for Frank Phillips?
A) He was able to become a partner in the bank.
B) He built banks all over the state.
C) He used bank connections to open other doors.
D) He made money from bankers.

B) he built banks all over the state

Explanation: Realizing that banking offered more security than wildcatting for oil, as early as 1905 Frank and L. E. had organized a Bartlesville bank. Shortly before World War I the brothers began reducing oil interests in hopes of opening a chain of banks in the Midwest.

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