$\mathop {\text{Limit}}\limits_{h \to 0} \frac{{\int\limits_a^{x + h} {\ln^2 t \, dt} - \int\limits_a^x {\ln^2 t \, dt} }}{h} = $
- A$0$
- B$\ln^2 x$
- C$\frac{2 \ln x}{x}$
- D$\text{does not exist}$
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