A government organisation that monitors the trading of narcotics has recently released report, declaring tax evasion should be included in all treaties of extradition as an important step of fighting drug trafficking and money laundering. This organisation claims that, to fight international drug dealers, it is very Important to curb money laundering, while most money laundering involves tax evasion. Many countries have not included tax evasion into treaties of extradition while less democratic countries are unlikely to extradite criminals because of tax-concerned crimes.

Question: Compared to encouraging existing customers to expand the use of a product, attracting customers from competitors has stronger cost effectiveness.
Options:
A. true, B. false, C. uncertain
Answer: "A"