Explanation:

- Let's assume the principal amount is P.

- If the money triples in 8 years, the total amount will be 3P.

- The simple interest formula is: $$ \text{Interest} = P \times r \times t $$

- In 8 years the interest gained is 2P, since: $$ 3P = P + 2P $$

- Thus, 2P = P × r × 8, so simplification gives r = 0.25 or 25%.

- In 20 years: $$ \text{Amount} = P + P × r × 20 = P + P × 0.25 × 20 = 6P $$

- Hence, the money becomes 6 times in 20 years.

- Option 2: 6