Astanza in a poem is
a set of lines in a poem, set apart from other sets of lines by space
a sound pattern (a beat) using one or more kinds of meter
the number of "feet" or units of syllables in a line of poetry
the pattern of rhyming words or ends of lines that rhyme in a poem

The correct answer is A. A set of lines in a poem, set apart from other sets of lines by space

Explanation:

In poetry, a stanza refers to the group of lines, called verses that create a unit similar to the paragraphs in a text and therefore are separated from others by space or indentation. The number of lines or verses included in each stanza during a poem can vart or follow a specific pattern, for example, the poem might contain only stanzas of four verses which are called quatrains or stanzas of six verses, followed by stanzas of three verses in which case is called sestinas. This element and the way verses are created by different "feet" or units of syllable provide the poem rhythm and is usually connected to rhyme which is the repetition of sounds in different verses. Considering this, the stanza in a poem can be defined as "A set of lines in a poem, set apart from other sets of lines by space".

this is a good question! i'll do some research and come back when i have the answer!