1. Indicate the smallest among these fractions.
(A) $\frac{2016}{2015}$
(B) $\frac{2015}{2014}$
(C) $\frac{2017}{2016}$
(D) $\frac{2019}{2018}$
(E) $\frac{2018}{2017}$
(1) The correct answer is $(D)$.

The fractions are all of the form $\frac{x+1}{x}=1+\frac{1}{x}$, so the smallest one is the one that has the largest denominator $x$.

Question proposed by Gabriele Manganelli.