The correct answer to your question is option "D".
The correct version of this sentence is "Es la chaqueta de Roberto."
"de" means "of" or "from" (in Spanish, it is basically saying that it is Roberto's jacket) it wouldn't be "sin" since that means "without", it wouldn't be "con" since that means "with" (that wouldn't be grammatically correct), and "a" means "to"( this also wouldn't be grammatically correct.
