Although a liver cell and a muscle cell in a
human developed from the same single cell,
their appearance and functions are different.
this is because the liver cell
(1) contains different genes than the muscle cell
(2) expresses different genes than the muscle
cell
(3) destroys the muscle cell genes it contains
(4) lacks the genes found in muscle cells

The correct answer is-

(2) expresses different genes than the muscle  cell.

Liver cell and muscle cell in human are developed from the same single cell but perform different functions that is they are specialized to perform particular function.

It is because there is differential expression of genes in these cells. In other words, specific genes are turned on to perform specific functions and other genes are turned off.

Gene expression means transcription ( formation of mRNA from DNA) and translation ( formation  of protein from mRNA) of gene ( a DNA segment, which codes for particular protein) so as to form a specific protein or polypeptide.

The protein thus produced, provides specific function to the cell.

Thus, different genes are expressed in specialized cells ( such as muscle and liver cell), which enables them to perform specific functions.