The C-O-H bond angle in methyl alcohol is ${\theta }_1$ and the C-O-C bond angle in dimethyl ether is ${\theta }_2$.  The correct relation is 

Both ${\theta }_1$ and ${\theta }_2$ are greater than $109°{28}^1$

Both ${\theta }_1$ and ${\theta }_2$ are lesser than $109°{28}^1$

${\theta }_1$ is greater than $109°{28}^1$ but ${\theta }_2$ is lesser than $109°{28}^1$   

 ${\theta }_1$ is lesser than $109°{28}^1$ but ${\theta }_2$ is greater than $109°{28}^1$