The correct answer is option 'A' - 350.

Slenderness ratio is a term used to describe the ratio of the length of a member to its radius of gyration. It is an important factor in determining the stability of a member under different loading conditions. In the case of a tension member, the slenderness ratio is calculated by dividing the length of the member by the radius of gyration.

When a tension member is subjected to wind loading, there is a possibility of reversal of stress. This means that the direction of the force acting on the member can change, causing the member to experience compression instead of tension. This is known as the buckling phenomenon.

To prevent buckling and ensure the stability of the tension member, it is important to limit its slenderness ratio. When the slenderness ratio exceeds a certain value, the member becomes more susceptible to buckling. Therefore, the slenderness ratio of the tension member should not exceed a certain limit to ensure its stability.

In this case, the correct limit is a slenderness ratio of 350. This means that the length of the tension member should not exceed 350 times its radius of gyration. If the slenderness ratio exceeds this limit, the member may buckle under wind loading and lose its stability.

It is worth noting that the specific value of the slenderness ratio limit can vary depending on the material properties and design standards. Different codes and specifications may have different recommendations or requirements for the slenderness ratio of tension members. Therefore, it is important to refer to the relevant design standards and guidelines to determine the appropriate slenderness ratio for a specific application.