Hi!
Let’s see how each answer options can be made from an Ethanol to subsequently reach the conclusion:
A requires elimination.
As we know that Ethanol is a primary alcohol on oxidation it forms an aldehyde and on subsequent oxidation it turns into an acid so we can remove answer options B&C as they are wrong.
D requires dehydration.
E however can be done by substitution.
If it were Ethene then by addition of bromine we would have formed bromoethane.
Hope it helps:)