Which sentence below is properly punctuated?
a. bertie was proud of his new title; vice president in charge of special tasks.
b. bertie was proud of his new title: vice president in charge of special tasks.
c. bertie was proud of his new title vice president in charge of special tasks.

b. Bertie was proud of his new title: Vice President in charge of Special Tasks.

A colon is used only after an independent clause. In this sentence, "Bertie was proud of his new title" is the independent clause; it can stand on its own. "Vice President in charge of Special Tasks" is simply the name of her title. It is not an independent clause. When using a semicolon (;), the sentence must be balanced on either side of the semicolon.

A sentence which punctuated correctly below is B. Bertie was proud of his new title: Vice President in charge of Special Tasks.

Punctuation are used in writing to clarify the meaning of the sentence or to separate elements in the sentence.

Some of the punctuations marks are period, comma, semicolon, apostrophe and so forth.

The above phrase is punctuated correctly because it applies the appropriate usage of a colon.

Colon is one of the punctuation which is used to:

1. Lay emphasis

Example: He loved just one: Bruno, his dog

2. To present dialogue ( we write the name of the speaker and then insert colon followed by his/her dialogue.)

Example: Rita: How are you?

Mary: Fine, and you?

3. Clarify composition titles ( to explain parallel ideas colon is used in compositions like lectures or book titles), and

Example: Rousseau’s Dog: Two Great Thinkers at War in the Age of Enlightenment

4. To introduce text or lists.

Example: Three types of Subordinate or Dependent Clauses are: Adjective clause, Adverb clause and Noun clause

Hence, in the above sentence, the sentences clarifies two parallel ideas "Bertie was proud of his new title" and "Vice President in charge of Special Tasks."

roses are red,

violets are black,

for what you said,

i hope you sit on a big fat tack.

i wish you all a merry christmas!  

and or happy hanukkah

and a happy new year