A: There might very well be. As hard as it might be to believe, there's a chance that a thorn, a tiny little thorn, worn by a man, who may or may not have existed, thousands of years ago, might survive to this day. Highly unlikely, sure, but possible. Stranger things have happened. A thorn from the crown of thorns could exist.
What you have in your hand, however, is not one of those thorns.
I'm pretty sure a thorn from the crown of thorns would be an actual thorn, probably from a bush. Or a rose.
It would not be a thumbtack.
What you have looks suspiciously like a thumbtack.
A thumbtack that has been covered in red paint.
Yup, that's a thumb tack all right.
A thumb tack from Staples.
There's still a price tag on it.
I highly doubt the crown of thorns worn by Jesus Christ was made entirely of Staples thumbtacks. You'd think they would have mentioned that in the Bible.
You'd think Staples would mention that today, by holding a "He Died for Our Sins Sale," or a "Jesus Paid the Price, so you Don't Have to Sale." Something like that.