The problem is asking to divide two fractions:

$\frac{2}{5} \div \frac{7}{3}$

To divide fractions, we multiply the first fraction by the reciprocal (flip) of the second fraction:

$\frac{2}{5} \div \frac{7}{3} = \frac{2}{5} \times \frac{3}{7}$

Now, multiply the numerators and the denominators:

$\frac{2 \times 3}{5 \times 7} = \frac{6}{35}$

So the correct answer is:

$\boxed{A. \frac{6}{35}}$

Would you like more details on how to divide fractions or any other clarifications?

Here are 5 related questions to explore:

1. How do you simplify a complex fraction?
2. What is the difference between multiplying and dividing fractions?
3. Can you divide a whole number by a fraction?
4. How do you convert a mixed number to an improper fraction for division?
5. How do you divide fractions with variables?

Tip: When dividing fractions, remember to multiply by the reciprocal of the second fraction!