Acircuit is:

a. the complete path of an electrical current.
b. a switch that interrupts an electric current.
c. an open path of an electrical current.
d. the incomplete path of an electrical current

The north and south regions had very diferent economies in the 1800s.

Design a class tictactoe that: holds the following information about the game: two-dimensional array (3 by 3), and winner. add additional variables as needed. includes the functions to perform the various operations on objects. for example, function to print the board, getting the move, checking if move is valid, determining if there is a winner after each move. add additional operations as needed. includes constructor(s). write the functions of the class, and write a program that uses the class. the program should declare an object of type tictactoe. the program will create the board and store it in the array. the program will allow two players to play the tic-tac-toe game. after every valid move update the array, check if there is a winner. if there is no winner and no tie, then print the board again to continue.

What is one reason why indoor air pollution has become an increasing problem.