Physics help? Can't figure it out

When two vectors sum to zero, how must they
be related?
1. The magnitudes are different; the directions are opposite.
2. The magnitudes are the same; the directions are opposite.
3. Both magnitude and direction are the
same.
4. The magnitudes are different; the directions are the same.
5. All are wrong

First, I'm not a physics expert; others will likely give you a better answer.

I believe the answer to your question is #2; the magnitudes are the same, the directions are opposite.