The recent discovery of the existence of a far greater number of planets than had previously been thought only _____ undergirds the argument for intelligent lifeforms; such an argument depends on more than a mere tally of planets, for only those planets that can form a viable atmosphere can host the conditions necessary for life.
A.subtly
B.minimally
C.obliquely
D.retroactively
E.discursively
F.indirectly