electric field lines for an isolated charge show the direction?

Question

a) that a positive test charge would move
b) that it randomly oriented
c) that a negative test charge would move

Answer 1

Answer is a) that a positive test charge would move.

Electric field lines from an isolated charge move towards the negative charge , that is outwars from an isolated positive charge and inwards from an isolated negative charge that means if a positive test charge is released it will move along the electric field line , that is positive to negative. So a) is the correct answer.

This pic will help you visualize it :
http://buphy.bu.edu/~duffy/PY106/2e.GIF

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Check out this link for further clarification .