The correct answer is: A. 42nd constitutional Act
The right to property was deleted from the list of fundamental rights by the 42nd constitutional Act of 1976. This act was passed by the Indira Gandhi government, which was facing a financial crisis. The government argued that the right to property was a major obstacle to economic development, and that it was necessary to remove it from the list of fundamental rights in order to allow the government to take necessary measures to address the crisis.
The 42nd constitutional Act was a major amendment to the Indian Constitution, and it was controversial at the time. However, it has since been accepted as a necessary measure to address the economic crisis that India was facing at the time.
The other options are incorrect because they are not the acts that deleted the right to property from the list of fundamental rights. The 43rd constitutional Act was passed in 1977, the 44th constitutional Act was passed in 1978, and the 47th constitutional Act was passed in 1984. None of these acts deleted the right to property from the list of fundamental rights.