Your word power is anything but meager if you picked B. While "meager" suggests a lack of fullness, richness, or plenty (as in, "a meager diet"), "scanty" stresses that something is not enough in amount, degree, or range (for example, "a scanty supply of fuel"). Something that falls short of what is desirable, but can still satisfy whatever is needed, may be described as "scant" (such as, "scant daylight hours in winter"). "Sparse" is another synonym that belongs in this group. It implies a scattering of a small number of units (as in, "a big country with a sparse population").