His mother wanted him to play for Jamaica, and considering he's just a kid it's a more than considerable influence. And he'd slot right into their first XI without much trouble, too.
Calling up a player just because it stops him from playing for his country of birth is kind of sad, really.
His mother, not him. And given he took the call up, clearly he chose england.
Not really, its clear he is going to be some player. Its also not specific to england