Answer: (a) Only one statement
Statement 1 is incorrect. The Court quashed two one-year extensions given to the Director of Enforcement, S.K. Mishra, not all extensions.
Statement 2 is correct. The amendments made in 2021 do allow for annual extensions to the heads of the CBI and ED until they complete five years in office.
Statement 3 is incorrect. The Court did not find that the amendments violate fundamental rights.
Statement 4 is incorrect. The Court's verdict is seen as a setback to the institutional independence of investigative agencies, not a promotion of it.