While I can see the argument as to how the four choices reflect each Chaos god, I have to disagree with that assessment. The impression I'm getting is that Slaanesh is a foregone conclusion and this vote is just what flavor of Excess Erika lean's towards the most. Slaanesh is more than sex, drugs, and rock n roll. They are Excess. They're about taking one thing and following it beyond all reason and sanity.
[ ] Glory. The clash of arms and the thrill of victory is an intoxicating mix, the triumph of victory over a worthy foe sweeter than the finest wine. The visceral thrill of bloodshed warms you in the cold depths of the night.
Battle and murder, sure seems like Khorne. Except the description is less about murder, rage, and bloodshed and more about the thrill of battle. At how amazing it feels to find someone strong and show them your better. The adrenal rush of proving your superiority through force of arms. This is Slaanesh in the guise of the perfect champion, the eternal victor, the peerless duelist without equal.
[ ] Perfection. The horizon beckons, the infinite expanse of the ideal calling to you with siren sweet songs.. Live, grow, strive and prosper; one step after another on the path, until your father smiles with pride.
The 'Slaanesh option' as other have pointed out. Strive for perfection, no matter how impossible. The folly of the Emperor's Children if your more familiar with the 40K side of things. Pretty straight forward, walk in the path set by the Perfect Prince.
[ ] Serenity. Peace, at last, is the only prize worth the name. You rest beneath shadowed boughs, swim through shining currents, live and laugh and love with friends and those closer still.
Eternal rest and idle hedonism. Just do what you like without a care in the world. Nurgle offers eternity. Not so much one you enjoy but one you learn to live with and like in spite of itself. A kind of nihilisic continuation of existence where everything is terrible but you smile anyway. That Slaanesh has a section of their Palace that specifically tries to swindle you with eternal rest just makes it more obvious to me.
[ ] Ambition. Daemons and monsters fall before you, rent apart by blade and spell. With every passing day you grow stronger; with every enemy slain your name is spoken by another adoring soul. Listen, and stand proud.
Defeating monsters, achieving against impossible odds, and being adored by the masses. Sure seems like the kind of thing someone obsessed with becoming great would love to do and have. Not so much magic, conspiracy, and backstabbing.