Answer
$120^o$
Work Step by Step
There are 12 hours around a clock.
One rotation around the clock makes 360 degrees.
This means that in each hour, a clock's hand moves:
$=\dfrac{360^o}{12}
\\=30^o$
There are 4 hours from 12 o'clock to 4 o'clock.
This means that from 12 to o'clock to 4 o'clock, the clock's hour hand moves:
$=4(30^o)
\\=120^o$