The price elasticity of demand for smartwatches is -1.4. It can be concluded that a 15% reduction in their price would lead to a percentage change in quantity demanded of
−10.7%-10.7\%−10.7%
−21.0%-21.0\%−21.0%
+10.7%+10.7\%+10.7%
+21.0%+21.0\%+21.0%