Please Identify What Type of Error the Following Sentence Includes

Multiple Choice

Please identify what type of error the following sentence includes: The company's ten year anniversary is an important milestone.

A) Capitalization
B) Punctuation other than commas or semicolons (including hyphens and apostrophes)
C) Commas or semicolons
D) Number expression (word or figure form)
E) Symbols (including dollar and percent signs)