Which of the following proportions is false? Select one:

A. \(\frac{20}{50} = \frac{40}{100}\)

B. \(\frac{18}{48} = \frac{30}{50}\)

C. \(\frac{12}{15} = \frac{20}{25}\)

D. \(\frac{25}{45} = \frac{50}{90}\)