Group B is an easy one for Arsenal. They can even win all of their matches if they concentrate on all of them equally. They might be a young team now but they are still way more powerful than all of their opponents in this group. The only competition might be made by PSV against them but I think Arsenal wouldn't struggle against them too much either.
This feels like no different than a Europa League group honestly. I remember Arsenal and PSV in the same group there before.
When it comes to Sevilla's chance in this group I think they will finish behind PSV if they don't improve their current performance.
Arsenal got a good spot I must concur and PSV has always been a worthy competition in getting the team the three points they need. For the preliminary stages, I ain't scared until it gets to when the pressure of premier league and other league matches starts bumping weekend in, weekend out.
What the gunners need is a team that doesn't lack stamina or whose muscles bow to cramps once the game gets above 90minutes.
I think Arsenal will win the group because seeing Arsenal's game in the EPL this season is quite good with 3 wins and 1 draw. For second place, maybe Sevilla, why Sevilla? Even though it is not doing well in the league, in the European arena it cannot be underestimated. PSV is indeed good but in my opinion it will occupy the 3rd and final position, definitely Lens