Final answer:
Most marketing researchers recommend scales with 5 to 7 points as being optimal for marketing research.
Step-by-step explanation:
Most marketing researchers recommend scales with 5 to 7 points as being optimal because they provide a good range of response options without overwhelming respondents with too many choices. This range allows for enough differentiation in responses while still being easy for respondents to understand and make choices. For example, a 5-point scale can use options like 'strongly disagree,' 'disagree,' 'neutral,' 'agree,' and 'strongly agree.'