Daily demand for newspapers for the last $10$ days has been as follows $($listed from oldest to newest$)$: $12,13,16,15,12,18,14,12,13,15.$ Forecast sales for the next day $($i$.$e$.$ day $11)$ using a two$-$day moving average.

$14$

$15$

$13$

$28$

none of the above