Double negatives in MCQ is like double jeopardy

In the MCQ Bar Reviewer, Volume I, 2011 Edition by the Philippine Association of Law Schools, Justice Roberto A. Abad laid down the guidelines in the construction of multiple choice questions.

One of these is:

One page 405 the question uses double negative:

The answer key says the correct choice is (c).  But removing the double negative will change the question into "Which of the following statements may be tenable?" which makes choice (c) wrong and the rest correct.

Following Justice Abad's admonition the question should be reframed thus:

           "The following statements may be tenable, except:"