Answer:
Correct answer is extending slavery in the south to border states.
Step-by-step explanation:
First option is not correct as colonists believed that British government is not grateful for all the things that they have done, and even punished them with severe taxes.
Second option is also not correct as colonists asked that they have someone who will represent them in the British Parliament.
Third option is not correct also as people believed their rights are limited by severe acts that Britain introduced. Just take for example Intolerable Acts.
Last option is correct as question of slavery was practically neglected by the authorities until 19th Century.