If $${\text{2cos}}\theta- \sin \theta= \frac{1}{{\sqrt 2 }},$$$$\left( {{0^ \circ } < \theta< {{90}^ \circ }} \right)$$the value of $$2\sin \theta $$+ $$\cos \theta $$is?

• A. $\frac{1}{{\sqrt 2 }}$$
• B. $\sqrt 2 $$
• C. $\frac{3}{{\sqrt 2 }}$$
• D. $\frac{1}{{\sqrt 3 }}$$