What was the Calhoun doctrine? He pressed for states rights in the case of slavery.
He wanted states to have the right to nullify national laws.
He tried to enforce national laws over states rights.
He supported the increased tariffs to promote industries in his home state.

B) He wanted states to have the right to nullify national laws.

Explanation:

Calhoun argued that the American union consisted of sovereign states who could override federal laws. For reference, this is also called the "Nullification Crisis".

d. she conquered the black sea coast and parts of poland.

depends on the age of the teen, many believe by the age of 16 a person should know the strong difference between right and wrong along with the difference between risky and immediate death. swimming with sharks might be dangerous but swimming with sharks while bloody meat is attached to you is just insane. even more if you have no idea what you're doing. however, no matter the age, as long as the person is skilled enough and has the mental and physical capacity to control their actions doing whatever sport they put their mind to is all that matters.