[单选题]
The binding energy per n /cgt:rxu ab)(*rlr/xuyupgs.icwisv.8m u0q 2uo 9br4/nwhq7h h) (.cleon
A. increases steadily as we go to heavier elements.
B. decreases steadily as we go to heavier elements.
C. is approximately constant throughout the periodic table, except for very light nuclei.
D. has a maximum near iron in the periodic table.
