Step 1: Understanding the reaction of ionic hydrides with water. Ionic hydrides, such as sodium hydride (\({NaH}\)) and calcium hydride (\({CaH}_2\)), contain the hydride ion (\({H}^-\)). When they react with water, they form a strong base (\({OH}^-\)) and release hydrogen gas: \[ {MH} + {H}_2O \rightarrow {MOH} + {H}_2 \] where \( M \) is a metal.
Step 2: Identifying the nature of the solution. Since the reaction produces hydroxide ions (\({OH}^-\)), the solution becomes basic. Hence, the correct answer is (C) Basic solutions.