1. It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.

The argument is most vulnerable to which of the following criticisms?

A. It fails to establish whether bacteria actually developed on Mars.
B. It fails to establish how likely it is that Martian bacteria were transported to Earth.
C. It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth.
D. It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria.
E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.

Pls show me your reasoning progress, not just answer.
I chose A. Why am I wrong?

Above question is discussed in: it-is-theoretically-possible-that-bacteria-developed-on-q1-12260.html


2. Past assessments of the Brazilian rain forest have used satellite images to tally deforested areas, where farmers and ranchers have clear-cut and burned all the trees, but such work has not addressed either logging, which is the removal of only selected trees, as well as surface fires, burning down individual trees but do not denude the forest.

A. which is the removal of only selected trees, as well as surface fires, burning
B. which removes only selected trees, or surface fires that burn
C. which removes only selected trees, along with surface fires that burn
D. removing only selected trees, or surface fires, burning
E. removing only selected trees, as well as surface fires that burn

I was so confused between B and D. B seems to against unparallelism "..which...that.."
D looks ok but seems still awkward..

Above question is discussed in: past-assessments-of-the-brazilian-rain-forest-have-used-13241.html

2. Past assessments of the Brazilian rain forest have used satellite images to tally deforested areas, where farmers and ranchers have clear-cut and burned all the trees, but such work has not addressed either logging, which is the removal of only selected trees, as well as surface fires, burning down individual trees but do not denude the forest.

B. which removes only selected trees, or surface fires that burn

B for ||sm

which/ that - restrictive/non-restrictive clauses - I do not see any problem here.
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