The Following Sentences Form a Paragraph

The following sentences form a paragraph. Proofread them for inconsistent tense and faulty parallelism. Identify the type of each error in each sentence, or select "correct" if the sentence is free of errors.
-The Johnstown flood of 1889 was perhaps the worst flood disaster in the United States in the nineteenth century.

A) correct
B) inconsistent tense
C) faulty parallelism