In order to solve this exercise, it is important to remember that an Obtuse angle is an angle that is larger than a Right angle (an angle that measures 90 degrees) and it is less than a Straight angle (an angle that measures 180 degrees).
You can see in the picture that there are two perpendicular lines that intersect. Since they are perpendicular, the intersection forms 4 Right angles.
Notice then that these angles measure 90 degrees:
Notice these angles measure 180 degrees:
Therefore, based on the definition of Obtuse angles, you can identify that these are:
The answer is: Second option.