Final answer:
The Last Glacial Maximum and Medieval Warm Period are the climatic time periods that are more global in extent.
Step-by-step explanation:
The climatic time period that is thought to be more global in extent than the others is the Last Glacial Maximum (option B) and the Medieval Warm Period (option C). The Last Glacial Maximum was a period of maximum glacial advance and occurred about 20,000 years ago. It affected large parts of the Earth, including North America, Europe, and Asia. The Medieval Warm Period, on the other hand, was a relatively warm period that occurred from the 10th to the 13th century and also had a global extent, impacting regions like Europe and North America.