To determine the length of each segment of a ruler that measures 1 foot when bisected, we first convert the total length from feet to inches.
1 foot is equal to 12 inches. When we bisect the ruler, we are dividing it into two equal segments.
So, we calculate the length of each segment:
\[ \text{Length of each segment} = \frac{\text{Total length}}{2} = \frac{12 \text{ inches}}{2} = 6 \text{ inches} \]
Therefore, the length of each segment of the bisected ruler is 6 inches. The correct answer is:
B. 6 inches.