“…In order to maintain the independence mentioned above, caution should be exercised in using the options “All of the above” and “None of the above.” Nevertheless, if it is decided to use them, it is important to bear in mind the following: The former appears to introduce an additional difficulty (Dudycha & Carpenter, 1973; Mueller, 1975), especially for subjects with low levels of knowledge (Martínez, Moreno, Martín, Trigo, & López, 2004), probably because it requires them to know that at least two of the above are correct. For its part, the option “None of the above” has a general difficulty effect (Dochy, Moerkerke, De Corte, & Segers, 2001;Haladyna et al, 2002), at least when it is constructed as the correct option (Martínez et al, 2004), probably because it involves negative language and logic, referring to what things are not, an indirect and normally more complicated form than referring to them in positive terms.…”