The best explanation for the expansion of voting rights to all white males regardless of land or property ownership is:
A. Andrew Jackson and the Democratic Party rose to power with the intention of creating a truer democracy.
Andrew Jackson's rise and the subsequent policies of the Democratic Party were significant in promoting the idea of a broader democracy that included all white males, not just landowners. This shift reflected a growing sentiment against the elitism of previous political structures and aimed to empower the "common man."