Which of the following statements is true about adverbs?
adverbs directly precede the noun they modify.
adverbs can occupy several positions in the sentence.
adverbs always follow the verb they modify.
adverbs only modify the verbs in a sentence.

The correct answer is B. Adverbs can occupy several positions in the sentence

Explanation:

An adverb is a type of word whose main function is to modify other words including verbs, adjectives or even another adverb. Additionally, adverbs have multiple purposes including to express time, degree, place, frequency, etc, that mainly are part of the context in a sentence and that give information about the words they modify. Examples of adverbs include words such as impatiently (adverb of manner), never (adverb of frequency), here (adverb of place) or today (adverb o time). Also, as adverbs can modify different types of words and provide information in different ways, the position of adverbs is not fixed, instead they can appear in almost any type of position depending on the type of adverb and the type of word they modify. Considering this information the statement that is true about adverbs is that "Adverbs can occupy several positions in the sentence" because these type of words modify other types (verbs, and adverbs) and also provide different types of information (time, frequency, manner, etc) and therefore can be placed in different positions.