Step 1

Let's write down these fractions:

Step 2

First, we multiply the numerators (5 x 3). This gives 15.

Step 3

Next, we multiply the denominators (7 x 10) together. This gives 70.

Hence, we have the fraction ¹⁵/₇₀.

Step 4

Now, we can simplify ¹⁵/₇₀ by dividing the numerator and denominator with 5. This gives the fraction, ³/₁₄:

Step 5

Here, we can no longer able to further simplify ³/₁₄. Therefore, the answer is B.