To determine the approximate age of sand engravings excavated from a coastal site in South Africa, archaeologist Charles Helm and colleagues collected samples of sediments surrounding the engravings; these samples were then analyzed using a method known as optically stimulated luminescence (OSL) dating. OSL dating indicated that the engravings were between 129,000 and 149,000 years old.
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Verbal·Expression of Ideas·Transitions
mediumWhich choice completes the text with the most logical transition?
A
Similarly,
B
Ultimately,
C
By comparison,
D
In addition,