Based on historical context, despite many strengths, Herbert Hoover's weakness as a Republican candidate in
1928 was "his lack of experience in elective office."
Herbert Hoover emerged as the Presidential candidate for Republican Party following the refusal of the outgoing President Calvin Coolidge to seek reelection.
Herbert Hoover, at the time of gaining the Presidential candidate of the Republican Party, has performed the following roles:
Herbert Hoover contested against Al Smith of the Democratic Party, a former Governor of New York.
Hence, in this case, it is concluded that the correct answer is option A. "his lack of experience in elective office."
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