Table:
text: United States House of Representatives elections, 1930
Alabama
Alabama
District Incumbent Party First_elected Result_ Candidates
Alabama 1 John McDuffie Democratic 1918 Re-elected John McDuffie (D) Unopposed
Alabama 2 J. Lister Hill Democratic 1923 Re-elected J. Lister Hill (D) Unopposed
Alabama 3 Henry B. Steagall Democratic 1914 Re-elected Henry B. Steagall (D) Unopposed
Alabama 4 Lamar Jeffers Democratic 1921 Re-elected Lamar Jeffers (D) 68.5% E. D. Banks (R) 31.5%
Alabama 5 Lafayette L. Patterson Democratic 1928 Re-elected Lafayette L. Patterson (D) Unopposed
Alabama 6 William B. Oliver Democratic 1914 Re-elected William B. Oliver (D) Unopposed

Question: How many districts does Alabama's william b. Oliver in the United States House of Representatives election, 1930?