To find the number of dials in an electromechanical meter, you need to look at the provided information. The question states that there is a total volume of 15 cm³ and 17 cm³. These volumes correspond to the values of the letters B and D, respectively.
In this context, the number of dials is indicated by the letter representing the volume. So, if B = 15 cm³ and D = 17 cm³, we need to determine which letter corresponds to the number of dials in the meter.
Therefore, based on the options provided:
- If B = 4 dials and D = 5 dials, then there are a total of 4 + 5 = 9 dials.
- If B = 5 dials and D = 6 dials, then there are a total of 5 + 6 = 11 dials.
- If B = 6 dials and D = 3 dials, then there are a total of 6 + 3 = 9 dials.
- If B = 3 dials and D = 4 dials, then there are a total of 3 + 4 = 7 dials.
Therefore, the correct answer would be:
B. 5 dials (B = 5 dials and D = 6 dials, totaling 5 + 6 = 11 dials).
