Altering incentives so that people take account of the external effects of their actionsa. is called internalizing the externality. b. can be done by imposing a corrective tax. c. is the role of government in markets with externalities. d. all of the above are correct.

Altering incentives so that people take account of the external effects of their action is d. All of the above are correct.

Explanation:

Internalizing the externality means shifting the burden, or costs, from a negative externality, such as pollution or traffic congestion, from outside to inside (external to internal). This can be done through taxes, property rights, tolls, and government subsidies.

the answer is true!                                          

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.