Ionization constant

Hey guys, I understand that a weak acid does not dissociates completely. The choices given is very intimidating. Near zero (which can either be greater than zero, but less than 1), about 1 ( can either be less than 1 but above zero). The answer gave much less than one. How can one come to know that H2S value? Or it's always much less than one when it comes to weak acid?

Thanks

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