During what geologic time period were ALL the continents joined together? A. Permian B. Triassic C. Jurassic D. Cretaceous

Its actually Permian

Your answer is D. Cretaceous. The Cretaceous Period extends from circa 145 million years ago to 66 million years ago. During the Cretaceous, the late Paleozoic-early Mesozoic super continent of Pangaea completed its breakup into present day continents, although their positions were substantially different at the time.