Choose the sentence that is not a mixed construction.
a) The reason the Boston Tea Party occurred is because protesters disagreed with the Tea Act of 1773.
b) The Boston Tea Party occurred because protesters disagreed with the Tea Act of 1773.
c) Because protesters disagreed with the Tea Act of 1773 is why the Boston Tea Party occurred.
d) For protesters disagreeing with the Tea Act of 1773 caused the Boston Tea Party.