Answer choice D is Correct.

The question asks why the lambda virus is incapable of infecting other bacterial species. If these species lack appropriate cell surface proteins, lambda phage may never be able to become adsorbed, or attached, to the surface of these cells. According to the passage, this attachment is the first step in the process of viral infection. If it can't occur, the virus doesn't infect the cell. We can approach this problem by a process of elimination as well. Answer choice A is incorrect because most bacterial species have circular chromosomes, not just E. coli. Additionally, having a circular bacterial chromosome has little to do with whether the lambda phage can infect a cell. Don't be confused by the passage, which states that the viral DNA is circular. Likewise, answer choice B is incorrect, as we know that E. coli has a circular chromosome (as opposed to the linear ones seen in eukaryotes). Choice C is tempting because we know from the passage that lack of a chromosomal integration site would prevent the lysogenic infection pathway from functioning. We can not say, however, that this would interfere with the lytic pathway; the virus might still be able to infect the cell and lead to lysis.