Answer:
Option 3 is correct.
Explanation:
Option 1: y = 0.25x
since, power of x is 1 in this function.
Thus this is a linear function.
Option 2: y =

Here, in this function power of x is 0.25
So, It is a polynomial function.
Option 3: y =

In this function we can see the term with log written.
Thus this is a Logarithmic function with base 0.25
Option 4: y =

In this function x is in the power of 0.25.
Thus this is a exponential function.