การอ่าน TOEFL

❓ คำถาม According to paragraph 2, which of the following is a reason why some critics oppose formalizing the Anthropocene as a new geological epoch?

A. A. The proposed markers, such as radioactive isotopes, are not detectable in most geological records.
B. B. Human impact began at different times, such as with agriculture, making a single start date difficult to justify.
C. C. The 'Great Acceleration' was not significant enough to leave a permanent stratigraphic signature.
D. D. The concept of geological epochs is outdated and no longer useful for modern scientific understanding.

B. Human impact began at different times, such as with agriculture, making a single start date difficult to justify.