we know that
Applying the Pythagoras Theorem
c²=a²+b²
in this problem
c=44
a=p
b=a-------> by angle of 45 degrees
so
b=p
44²=p²+p²------> 2p²=44²------> p²=44²/2-------> square root----> p=44/√2
p=44/√2*(√2/√2)----> p=44√2/2----> p=22√2 units
the answer is the option
B) 22 (sqrt) 2