Means that the information in the headings should be more general while the information in the subheadings should be more specific.
a. parallelism
b. coordination
c. subordination
d. division

Option c. Subordination.

Explanation:

When creating the body of an outline it is important to include and use correctly a set of techniques. One of them is called subordination, that allows you to convey differences in importance within the body of writing. So when writing a heading and a subheading, subordination means that the information in the headings should be more general while the information in the subheadings should be more specific.

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stewards ice box was the purchase of alaska from russia and it was called that because people thought it was not a good idea to purchase alaska