The points of extrema of $f(x) = \int_0^x \frac{\sin t}{t} dt$ in the domain $x > 0$ are
- A$(2n + 1)\frac{\pi}{2}; n = 1, 2, \dots$
- B$(4n + 1)\frac{\pi}{2}; n = 1, 2, \dots$
- C$(2n + 1)\frac{\pi}{4}; n = 1, 2, \dots$
- D$n\pi; n = 1, 2, \dots$
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