Final answer:
Republic Act No. 1234 is likely invalid as it imposes a property qualification for public office candidates, potentially infringing on democratic principles and equal protection rights.
Step-by-step explanation:
The question asks whether Republic Act No. 1234, which requires all candidates for public office to post an election bond equivalent to one year's salary for the position sought and forfeits the bond if they fail to obtain at least 10% of votes, is valid. Under constitutional democratic principles, this kind of legislation would generally be invalid as it imposes a property qualification on candidates, potentially barring those without sufficient means from running for office, and thus undermining equal political opportunity and the democratic process.
Option c. It is invalid as the requirement effectively imposes a property qualification to run for public office, and is the most cogent choice. This is because such a law could disproportionately affect candidates who do not have financial resources, thereby infringing on basic democratic principles and potentially the Equal Protection Clause of the Constitution, which requires that laws treat individuals in similar situations similarly.