The correct answer is - B-Earth is presently in an inter-glacial period.
In the climate patters of our planet we have a change of glacial and inter-glacial periods.
The glacial periods are the periods when the Earth experiences much lower temperatures, freezing of big portions of the water, vast ice sheets and glaciers, and increased land area because the seas/oceans are retracting.
The inter-glacial period is the period when the temperatures rise significantly, the ice sheets and glaciers retract and are limited only to certain places, the sea/ocean waters rise, the land mass decreases, and this what the Earth is experiencing in the past 12,000 years approximately.
The statement that says that the Earth is presently in an 'interglacial period' is true.
Explanation:An interglacial period is characterized by 'warmer temperatures spanning the entire globe'. This period lasts for thousands of years and only ends with the beginning of an 'ice age'. The present interglacial period that we are in began around 12,000 years ago with the 'end of the Pleistocene age'.It is estimated that 'an ice age' is due right after the ongoing interglacial period.