Geologist Marie Tharp produced the first comprehensive map of the ocean floor in the 1950s, revealing a vast underwater mountain range running down the Atlantic. ______ , her discovery provided crucial evidence for the theory of plate tectonics.
Which choice completes the text with the most logical transition?
- Acheck_circle
Ultimately
- B
In addition
- C
However
- D
Conversely
Explanation
The discovery led, in the end, to supporting plate tectonics. "Ultimately" signals an eventual outcome. "In addition" merely adds; "however" and "conversely" signal contrast.