Respuesta :
The statement that best describes that difference between presidential and parliamentary democracies is that "In a parliamentary democracy, the executive and legislative branches are joined while in a presidential democracy, the two branches are separate".
Both the presidential and parliamentary democracies are branches of democracies although,they are slightly different because of their structural organization.
Hence, the Option A is correct.
Read more about democracies
brainly.com/question/26100096