Multiple Choice
This graph shows an interpretation of temperatures based on the change in isotopes in ice-core data.This graph implies that: 
A) current temperatures are by far the hottest based on this record
B) atmospheric warming started as early as the late 1700s
C) the coolest time period on this data set was from around 1500 to the last part of the 1700s
D) all of these
Correct Answer:

Verified
Correct Answer:
Verified
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