Options:
A.
B.
C.
D.
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Earlier discussion
2 older comments kept for context.
Ayoade Basit
Since Ionization energy increases across the period and decreases down the group.
All the elements in the options are group(I) elements, with Lithium topping the chart. So therefore, the correct answer is B.
Al-Amin Awayeti
The answer is Li, because ionization energy increase across the period and decrease down the group.