Final answer:
The ratio of pencils to pens sold is 1/15.
Step-by-step explanation:
The ratio of pencils to pens sold can be written as a fraction as follows:
Pencils : Pens = 15 : x
Since the number of pencils sold is given as 15, we can substitute this value into the ratio:
15 : x
Therefore, the ratio of pencils to pens sold is 15 : x. Hence, the correct answer is option B) 1/15.