Options:
A.
B.
C.
D.
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Earlier discussion
1 older comment kept for context.
John Kenny Ade
Since NaOH is a strong base with a pH between 10 to 12 and 20cm3 of a solution of 8.4 is a weak base.
Therefore when 3 drops of NaOH are added the pH is greater than 8.4, therefore, it will migrate from a weak base to strong base.
Therefore the answer is C.