It is necessary because codons in the mRNA are read in the A

It is necessary because codons in the mRNA are read in the A site.

It is necessary for the proper assembly of the ribosome.

It is necessary to leave room for the second amino-acyl tRNA to occupy site A.

It is necessary because new peptide bonds form between the amino acids of the tRNA in P and the incoming amino-acyl tRNA in site A.

The wrong statement as needed by the question would be

is necessary for the proper assembly of the ribosome.

all the other three statements appear to be relevant to protien synthesis .... vacant A site has no role in ribosome assembly

Hope it helps feel free to comment and discuss I shall be glad to reply you .... Regards