题目信息
An increase in the number of protons, when unaccompanied correspondingly by an increase in the number of neutrons, almost always produce an unstable isotope of an element higher on the Periodic Table.
A:when unaccompanied correspondingly by an increase in the number of neutrons, almost always produce
B:when not accompanied by a corresponding increase in the number of neutrons, almost always produce
C:when that is unaccompanied correspondingly by an increase in the number of neutrons, almost always produces
D:if not accompanied by a correspondingly increased number of neutrons, almost always produce
E:if not accompanied by a corresponding increase in the number of neutrons, almost always produces
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正确答案：
E:if not accompanied by a corresponding increase in the number of neutrons, almost always produces
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