To determine how many players had a batting average of 0.340 - 0.349, we need to look at the frequency table provided.
The table shows the different ranges of batting averages along with the corresponding frequency, which represents the number of players within each range. Let’s examine the range of 0.340 - 0.349:
[tex]\[
\begin{array}{|c|c|}
\hline
\text{Batting Average} & \text{Frequency} \\
\hline
0.320 - 0.329 & 1 \\
\hline
0.330 - 0.339 & 2 \\
\hline
0.340 - 0.349 & 12 \\
\hline
0.350 - 0.359 & 14 \\
\hline
0.360 - 0.369 & 1 \\
\hline
\end{array}
\][/tex]
The frequency for the batting average range of 0.340 - 0.349 is 12. Thus, 12 players had a batting average within this range.
Therefore, the correct answer is:
B. 12