Electric field lines provide information about the field strength, direction, and nature of charge. Let's break down each aspect of this answer.

Field Strength:
Electric field lines are closer together where the field is stronger and farther apart where it is weaker. Thus, the density of field lines gives an idea about the strength of the electric field at different points. For example, if the field lines are closer together near a charged object, it means that the electric field is stronger at that point.

Direction:
The direction of the electric field lines gives information about the direction of the electric field at different points. The direction of the field lines is from positive to negative charges. Thus, the electric field lines always point away from positive charges and towards negative charges.

Nature of Charge:
Electric field lines give information about the nature of charge. If the field lines originate from a positive charge, it means that the charge is positive. Similarly, if the field lines end at a negative charge, it means that the charge is negative.

Conclusion:
In summary, electric field lines provide comprehensive information about the electric field. By analyzing the density, direction, and nature of charges, one can understand a lot about the electric field. Therefore, the correct answer is option 'D' - all of these.