Final answer:
Open-ended questions encourage discussion and typically start with 'How', 'Why', and 'What'. 'Is' usually precedes a closed-ended question, making C. 'Is' the correct answer.
Step-by-step explanation:
Open-ended questions usually begin with words that invite discussion and elaboration, such as "How", "Why", and "What". These types of questions are designed to elicit responses that provide insights, personal beliefs, political views, goals, or morals, and do not limit the respondent to a single, factual answer. Instead, they encourage short essay responses that provide qualitative data, which is subjective and varies from person to person. In contrast, "Is" often precedes a closed-ended question, which might be answered with a simple yes or no, thereby limiting the depth of response. Therefore, the correct answer to the question 'Open-ended questions usually begin with all of the following words EXCEPT' is C. "Is".