Phenyl magnesium bromide reacts with methanol to give

Which of the following reactions is used for producing symmetrical alkane with double carbon atoms?

The aldehydes which will not form Grignard product with one equivalent of Grignard reagents are
$\left(\mathrm{A}\right)$

$\left(\mathrm{B}\right)$

$\left(\mathrm{C}\right)$

$\left(\mathrm{D}\right)$

The product formed in the above reaction is