Which thesis statement is too broad for a short research report?
a. although slavery was a hotly contested issue between the north and south, the main cause of the civil war was the south’s demands for self-government.
b. the north and south fought the civil war for many reasons, but the main causes were disagreements over morality, self-governance, and slavery.
c. the north and south fought the civil war for many reasons.
d. the main cause of the civil war was disagreement over the issues of the morality and legality of keeping slaves.