The correct answer is A) calling a special session.
The power all governors have over state legislatures is calling a special session.
A special session is an extraordinary session in the state legislature. It is a session that was not programmed during the normal schedules of sessions in a legislature. The power all governors have over state legislatures is calling a special session. This can occur when the legislature needs to complete legislation such as in the case of the annual Budget. When there is any unfinished task, the Government can call a special session to finish what the legislature started in political or economic issues or in the case on an emergency.