The design of an ancient pyramid suggests that the population who built the structure had developed the solar calendar. The exterior walls of the partly ruined pyramid consist of four successive stairways, and if a platform at the top of the structure is imagined as a single step atop four stairways of 91 steps each, the total number of steps corresponds to the number of days in the year according to the solar calendar.
Which of the following, if true, most strongly supports the hypothesis?
【选项】
The ancient pyramid was the only major architectural structure known to have been built by the population.
选项是否正确？