Question

which sentence uses the word constrain correctly

Answer 1

The options are 

a.Her injury does not constrain her at all; she still skis and plays basketball. 
b.The townspeople tried to constrain the elephant to roam freely. 
c.Every good chef knows how to constrain an egg before adding it to a recipe.

Answer: A 

The word constrain has the idea of holding someone or something back. 

Answer 2

If the options above are really those you need, then I agree with the person who said the correct usage of the word constrain is found in A) Her injury does not constrain her at all; she still skis and plays basketball.

To constraint means to limit.