The correct option is C 3.2 × 10−19
Quantization of charge tells that amount of charge (q) on a body exists as an intergral multiple of charge on one electron(e). Which means it can be written as:
q = ne
Where
e = 1.6 × 10−19 C
n = 0,1,2.....(both positive and negative integers)
From the given possible values only option c is an integral multiple of e.
q = ne
3.2 × 10−19 = n × 1.6 × 10−19 C
n = 2
Hence option C is the correct answer