How many unknowns are there in 2-D space?

[Doubell]

Homework Statement

In 2-D space, the maximum number of unknown information is...
Select one:
a. 4
b. 2
c. 3
d. 1
e. 0

Homework Equations

The Attempt at a Solution

i think the answer is 1 comments would be appreciated

 

[BvU]

What do you mean with "number of unknown information" ?
If I place 1000 dots on a 2-D scrap of paper, aren't there a lot of unknowns ?