The correct answer is: B. They are difficult to validate.
Written tests are difficult to validate because they are often subjective and can be easily influenced by factors such as the test-taker’s mood, the difficulty of the questions, and the amount of time allowed to complete the test. Additionally, written tests can be difficult to score accurately, which can lead to unfair results.
Option A is incorrect because written tests can be relatively easy to construct if the test-maker is careful to follow proper test-construction procedures.
Option C is incorrect because written tests can be relatively inexpensive to administer, especially if they are administered online.
Option D is incorrect because written tests can provide a great deal of information about a test-taker’s knowledge and skills. However, this information can be difficult to interpret if the test is not properly designed and administered.