Question

the sun and other stars are powered by nuclear fusion reactions, in which two atoms collide to form a single heavier atom, releasing energy. scientists have long believed that fusion has the potential to meet humanity’s clean energy needs. ______ prior to december 2022, no fusion reaction in a laboratory setting had ever generated a net energy gain. which choice completes the text with the most logical transition? choose 1 answer: a specifically, b for this reason, c that said, d moreover.

Explanation:

The first part of the text mentions the potential of fusion for clean - energy. The second part points out a limitation (no net energy gain in lab prior to 2022). "That said" is used to introduce a contrasting or qualifying statement, which is appropriate here. "Specifically" is for giving details, "For this reason" is for showing cause - and - effect, and "Moreover" is for adding more of the same kind of information.

Answer:

C. That said,