Answer:
Because you're handsome, Helen Grey,
Is that a reason to be proud?
Your eyes are bold, your laugh is loud,
Your steps go mincing on their way;
But so you miss that modest charm
Which is the surest charm of all:
Take heed, you yet may trip and fall,
And no man care to stretch his arm.
It's the first answer. Readers know that Juliet is misleading Nurse.