151428948 : ngl I don't think it rlly matters if it's eu or us option. because why would you exercise your option before expiration day you are just missing out on extrinsic value. if you want to get rid of the option just sell it and the price should be almost identical to the gain you'd experience from exercising (if not greater considering when u sell there is still some time value)

Moomoo Buddy : Dear customer, Index options differ from single stock options and ETF options in how they can be exercised or assigned.
• Index options: The majority of index options are European style options that can't be exercised or assigned early. Currently, we only support trading European-style US index options.
• Single stock options & ETF options: Are usually American style options that can be exercised or assigned early.
The .DJX is an index, therefore the options are European style options.
If you have any questions, please feel free to contact us via [App - Me - Customer service - Online inquiry], or customer service hotline: 1300 086 668. Have a nice day!