Which of the Following Statements About Special Sessions of the Texas

Which of the following statements about special sessions of the Texas legislature is true?

A) Special sessions are a rare occurrence, called on average once a decade.
B) Special sessions were common in the nineteenth and early twentieth centuries, but have been rare during the past fifty years.
C) Special sessions are common, held an average of once a year since 1876.
D) Special sessions occur often, on average four times a year.
E) Special sessions can be called only once a year.