Choose the constant term that completes the perfect square trinomial.

y2 + 1/2y

The constant term is found by taking the coefficient of y, dividing it by 2, and squaring the result.

In this case, the coefficient is 1/2. 1/2 of 1/2 is 1/4.

The square of 1/4 is 1/16.

So, the constant term is 1/16.