The production function X = AL3/5

greater than 1
1
less than 1
zero

The correct answer is A. greater than 1.

The production function $X = AL^{3/5}$ is a Cobb-Douglas production function with constant returns to scale. This means that if we increase all inputs by a factor of $k$, the output will also increase by a factor of $k$.

In other words, if we have $L = 1$ and $A = 1$, then $X = 1$. If we increase $L$ to $2$ and $A$ to $2$, then $X = 2^3/5 = 8/5 > 1$.

Option B is incorrect because the production function is not linear. Option C is incorrect because the production function is not decreasing in $L$. Option D is incorrect because the production function is not equal to zero.