The correct option is B Cells are the smallest unit of life that can replicate independently.
The cell theory is one of the basic principles of biology. The credit
for the formulation of this theory is given to German scientists,
Theodor Schwann, Mattias Schleiden. Cell theory, stated that cells arise from pre-existing cells. They donot have the potential to replicate independently. They depend upon the parent cell, for the enzymes which are used for replication.
So, the correct answer is option B.