To determine how many beats are in one measure, I'd need to know the time signature you're referring to. However, the most common time signatures are:
- 2/4: 2 beats per measure
- 3/4: 3 beats per measure
- 4/4: 4 beats per measure
- 6/8: 6 beats per measure
- 9/8: 9 beats per measure
From your options, if we assume we are talking about standard time signatures:
- 2 beats (for 2/4)
- 4 beats (for 4/4)
- 6 beats (for 6/8)
- 9 beats (for 9/8)
Without the specific time signature provided, I cannot give a definitive answer. If you're working with a common time signature like 4/4, then the answer would be 4. Let me know the time signature for a more accurate answer!