S.H.
Absolutely "no" to all of them except, "D."
Possibly "C."
But, only IF, you know they like that particular item.
But NO way, would I get one gift for them both to share. No matter how old they are, no matter if they are 3, or 33 years old.
No way just one gift, to share.
Twins are different people. I know one pair of twins, that get sick and tired of people reacting to them as "twins." They are totally different from each other.