An example of an objective test is:

A. short answers.
B. essay-type exam.
C. fill in the blanks.
D. discussion board.

http://dictionary.reference.com/browse/objective+test

An example of an objective test is option C, fill in the blanks.

Objective tests are designed to have specific, correct answers and to measure a person's knowledge or understanding. The key characteristic of objective tests is that they have clear and unambiguous correct answers. This makes grading and scoring more straightforward.

To identify an objective test among the given options, we need to understand how each option functions.

Option A, short answers, can be subjective as it allows for students to provide brief but different responses. This makes it difficult to objectively grade.

Option B, an essay-type exam, is also subjective as it requires students to write in-depth responses with their own insights and interpretations. This can lead to varying perspectives and subjective grading.

Option C, fill in the blanks, is a classic example of an objective test. It usually consists of sentences, paragraphs, or diagrams with missing words or phrases, and students are required to fill in those gaps with the correct answers. There is usually only one correct answer for each blank, making it easier to assess and score the responses.

Option D, a discussion board, is not an example of an objective test. A discussion board typically involves students sharing their thoughts and opinions on a specific topic or question. It is subjective in nature as there can be different perspectives and interpretations.

Therefore, the correct answer is option C, fill in the blanks, as it aligns with the characteristics of an objective test.