Fusion employs the lightest nuclei because
A. fusion produces a nucleus whose binding energy per nucleon is smaller than that of the two parent nuclei.
B. they are more plentifully available.
C. they are easier to completely ionize and thus cause their nuclei to coalesce.
D. fusion produces a nucleus whose binding energy per nucleon is larger than that of the two parent nuclei.
D. fusion produces a nucleus whose binding energy per nucleon is larger than that of the two parent nuclei.
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