Research and learn from the ship.
The correct choice in my opinion.
As I said, the Reapers did not magically vanish, they are STILL out there. Examining this and hopefully finding a weak-point could be the only chance to truly defeat the Reapers. The main down-side is that Cerberus could use this to make another Reaper, which is virtually a non-problem. Firstly, it is not a simple process, to build the 'human-reaper larva'(ugh) and it would take time to build one. Secondly, Shepard has already defeated one reaper in Mass Effect 1 and destroyed a 'larval(uggghhhh) about 2 minutes ago, without losing anyone on his supposed Suicide Mission. Shepard and co. have proved they can handle 1 Reaper.
I chose this option based on what I've typed above and even Legion (who is my favorite character as he is the only one that seems to never hold the
idiot ball) said "This facility is simply data, Shepard-Commander. It has no inherent ethics."
I agree entirely.
But yet this is the supremely evil choice. After you do this every member of your party will disagree and chastise you. Even the murderous convict with tatoos from tit to ass. Even the blood-thirsty Krogan Clone. Even the assassin-for-hire.Even the
CERBERUS OPERATIVE.
Because you are inherently evil for studying a way to beat the enemy, even when you could blow up the station at any time should something go wrong.
As if.