Why did antifederalists oppose the new constitution?
a) they believed it favored the more populous states.
b)they believed it would create an autocratic federal government.
c)they believed it was a bundle of compromises.
d)they believed it would propel the nation into anarchy.
e) they believed it was weaker than the articles of confederation.

The correct answer here is the option B.

Anti-federalist's most prominent fear was that they would trade one tyranny for another one. As they name suggests they were against a strong federal government and they wanted the individual states to have more power than the federal government which they thought. if it was allowed to become to powerful, would oppress them just as the British one did.