A negative test charge experiences a force to the right as a result of an electric field. What is the best conclusion to draw based on this description?

The electric field points to the left because the force on a negative charge is opposite to the direction of the field.

Explanation:

Normally,in an electric field, the positive charge has tendency to move from higher to lower potential and therefore, experience the electric force in the direction of electric field since electric field lines are directed from high to low potential whike a negative charge has tendency to move from low to high potential and hence experience the electric force in the direction opposite to  electric field since electric field lines are directed from high to low potential.

Thus, we can say that; The electric field points to the left because the force on a negative charge is opposite to the direction of the field.

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