A Panchayat Samiti is constituted for each

block
village
district
locality

The correct answer is: A. block.

A Panchayat Samiti is a local self-government institution in India at the block level. It is constituted for each development block, which is a sub-division of a district. The Panchayat Samiti is responsible for a wide range of functions, including agriculture, rural development, education, health, and sanitation.

The other options are incorrect because:

  • A village is a smaller unit than a block.
  • A district is a larger unit than a block.
  • A locality is a smaller unit than a block.