The product obtained on reaction of optically pure 1-bromo-1-phenyl ethane with $$\text{CH}_3\text{OH}$$ is

A

phenyl ethene

B

1-methoxy-1-phenyl ethane with inverted configuration only

C

1-methoxy-1-phenyl ethane with retention of configuration

D

a racemic mixture of 1-methoxy-1-phenyl ethane