A) You have to substitute each value of "x" given in the table, into the function f(x)=1^x. Then, you have:
1. When x=0
f(x)=1^x
f(0)=1^0=1
2. When x=1
f(x)=1^x
f(1)=1^1=1
3. When x=2
f(x)=1^x
f(2)=1^2=1
4. When x=3
f(x)=1^x
f(3)=1^3=1
5. When x=4
f(x)=1^x
f(4)=1^4=1
B) You have now the values of "x" and "y", so, you can plot each point, as you can see in the graph attached.
C) As you can see in the graph attached, the exponential function f(x)=1^x, does not decrease and it does not growth. Therefore, the answer is "neither".