They make a statement false. Examples include words such as always, never, only, all, etc. In addition, many absolutes begin with the prefix in or ex. Examples include the words indefinitely and except. Look for words called qualifiers.
Most qualifiers end in st.
Examples include the words least, most, best, first, etc. and suggest that one answer is more qualitatively correct than the other options. Always go with the more specific option. Look for priority questions that ask for first or last. All choices may be true, but the highest priority option is the best response. On multiple-choice items, the option that is very different is usually not a good choice.