Who informs congress if the president cannot carry out the duties of the office?

the vice president
the president's cabinet
the president
the president's spouse

If the president cannot or will not inform the congress by him/herself, the Vice President informs the congress along with majority of cabinet members in written form.

Explanation:

c) troops march forward in close formation against newer, more accurate weapons

to reform the distraught soviet union, the democratization of the communist party was promoted through party secretary mikhail gorbachev's policies of “perestroika” and “glasnost.” perestroika refers to the reconstruction of the political and economic system established by the communist party.