Which of the following are acute angles?

Angle I is definitely an acute angle:

As for angle II, it is also an acute angle. This is because this angle is somewhere in between 0^{°} and 90^{°}.

Angle III is not an acute angle as it is greater than 90^{°}.

Again, angle IV is not an acute angle as this angle is greater than 90^{°}.

Clearly, only I and II are acute angles. Hence, the answer is B.

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