Which of the following best describes Harry Truman's background before his presidency?

Harry Truman's background prior to his presidency is best encapsulated by the description of him as a plain, decent man with no executive experience. Before ascending to the presidency in 1945, Truman had a relatively modest career in politics. He served as a U.S. senator from Missouri, which provided him with some legislative experience. However, he had never held a position as a governor or in a role that required executive leadership, making him less seasoned than many of his contemporaries.

Truman's character, often described as straightforward and sincere, resonated with many Americans, earning him a reputation as a decent individual. He was not known for an extravagant or charismatic persona; instead, his strengths lay in his determination and practical approach to governance. Therefore, this description aligns perfectly with his humble origins and the nature of his political career before he stepped into the role of president following Franklin D. Roosevelt's death.