To find the constant of proportionality in dollars per ticket, we need to determine the cost of one ticket based on the cost of a set of 3 tickets.
The cost of one set of 3 tickets is $5.00. Therefore, the cost of one ticket can be calculated as follows:
\[ \text{Cost per ticket} = \frac{\text{Total cost}}{\text{Number of tickets}} = \frac{5.00}{3} \]
Calculating this gives:
\[ \frac{5.00}{3} \approx 1.6667 \]
Rounding this to the nearest cent results in:
\[ 1.67 \]
Thus, the constant of proportionality in dollars per ticket is:
B. $1.67