Prior to the introduction of structural steel building techniques, large buildings were constructed using structural masonry. The Monadnock Building, built in Chicago in 1893, reached the practical height limit for structural masonry buildings. Why? Select one: a. In order to support the vertical loads, the base of the building had to be wide. Beyond 16 stories, the weight of an additional floor would necessitate the occupation of the the bottom floor with wide structural walls. Thus keeping the net gain in floor space close to zero. b. The high wind loads in Chicago, made buildings higher than 16 stories susceptible to failure due to wind stresses. Once builders discovered the use of structural steel they could design buildings to sway in the wind and transmit the wind forces safely to the ground. c. Beyond 16 stories, the lateral loads would cause the the upper third of the building to slip and potentially dislodge the masonry structural blocks. This would lead to catastrophic building failure. d. By the late 1890s, builders had discovered that structural steel was more resource efficient and made building tall buildings more economical. Thus, by 1893, the Monadnock Building was already obsolete