Final answer:
The Constitutional Court of Thailand dissolved the ruling party, the People Power Party (PPP), in 2008 due to election fraud. The correct answer is option A.
Step-by-step explanation:
The Constitutional Court of Thailand did not overthrow the government in 2008. However, the Thai Constitutional Court did dissolve the ruling party, the People Power Party (PPP), in December 2008 due to election fraud. The court found that the PPP had committed electoral offenses and ordered the party to be disbanded. This decision led to the fall of the government and subsequent political instability in Thailand.