Any opening can be agressive depending on what you and or your opponent do.
What is the most aggressive English Opening variation?
Various possibilities are discussed in The English: Move by Move by Steve Giddins (2012)
https://web.archive.org/web/20140627105428/http://www.chesscafe.com/text/hansen161.pdf
I've been playing around with the english opening 1.c4 and I'm wondering what the most aggressive/sharp line is.