Answer
Option D
When a grignard Reagent reacts with Ethylene Oxide... A Primary Alcohol is Formed.
CH2OCH2 + RMgX ==> RCH2CH2OMgX
When You Hydrolyze
You have
RCH2CH2OH
The Text written below may come in handy someday.
Hope you find it helpful.
One of the preparation of Alcohols is via Reaction with "Grignard Reagents" .
Grignard Reagents have the formula "RMgX"
Where R is an alkyl group eg CH₃, C₂H₅ etc
X is a halogen eg Cl,Br etc
Ethylmagnesiumbromide fits the description of grignard Reagent from what I wrote above.
The formula for Ethylmagnesiumbromide is
"C₂H₅MgBr"
Now
When grignard reagents react with Alkanals... They form alcohols.
Note this trend.
When a grignard reagent reacts with Methanal(Formaldehyde)... It forms a Primary Alcohol.
When a grignard reagent reacts with any other Alkanal besides Methanal(formaldehyde) ... it forms Secondary Alcohols.