Concept:This question tests the correct quantifier to use before the singular verb phrase "is known" to express the amount of information available.
Explanation:The missing word acts as the subject of "is known," so it must be a singular or uncountable quantifier.
"A few" is incorrect because it is used only with countable plural nouns and requires a plural verb like "are."
In this sentence, the reference is not to counting achievements but to the amount of knowledge about them, which is uncountable.
"Little" means "hardly anything" or "almost nothing."
"Little is known about her achievements" is the standard English expression meaning that almost no information is available.
"A little" would mean "some, but not much," which adds a positive tone and does not fit the intended negative meaning here.
Therefore, the most appropriate determiner is "Little."
Answer:B. Little