In order to eliminate the effect of temperature variations upon the length of the spring 

The correct option is 1

Concept:

• By using two springs coiled in opposite directions, the effects of temperature variations on the length of each spring can be counterbalanced.
• Coiling springs in opposite directions means that, as temperature increases (or decreases), one spring that might elongate (or contract) due to the temperature change will have its effects counterbalanced by the other spring that is coiled opposite to it. This counterbalancing act can help to maintain the overall length and effective "spring rate" of the combined spring assembly.
• So, even when the temperature changes and the springs expand or contract, the overall impact of temperature on the length of the spring system is minimized or eliminated. This is a corrective technique used in specific applications where precision is a high priority, and temperature fluctuations might interfere with accurate functioning.