this html is wrong correct answer is 7 

The correct answer is B) 7.

This value is found in ASCE 7 Table 12.2-1 for a dual system consisting of special moment frames and special reinforced concrete shear walls, provided the moment frames are designed to resist at least 25% of the prescribed seismic forces. In this case, the moment frames are designed for 65% of the forces, which satisfies the requirement for a dual system. According to Table 12.2-1, for a "Dual System with Special Moment Frames Capable of Resisting at Least 25% of Prescribed Seismic Forces" and using "Special reinforced concrete shear walls," the response modification coefficient, R, is 7.

Based on ASCE 7 Table 12.2-1, the structure described is classified as a Dual System because it uses special reinforced concrete shear walls and special moment frames, and the special moment frames are designed to resist 65% of the prescribed seismic forces (which exceeds the minimum required 25% threshold). 

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For a Dual System consisting of Special Reinforced Concrete Shear Walls and Special Reinforced Concrete Moment Frames, the response modification coefficient, R, is 7. 

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Structure Summary:

• System Type: Dual System (Special RC Shear Walls + Special RC Moment Frames)

• Moment Frame Resistance: 65% (meets > 25% requirement)

• R Factor: 7

• Deflection Amplification Factor (

• ): 5.5

• System Overstrength Factor (

• ): 2.5 

The 180-ft height is permissible under this classification, as dual systems with special moment frames have no height restrictions. 

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