One way an English sonnet is different from a Petrarchan sonnet because an English sonnet contains

A couplet <
A sestet
Give quatrains
None of the above

To determine the correct answer to this question, it is important to understand the basic structure of both English and Petrarchan sonnets.

An English sonnet, also known as a Shakespearean sonnet, follows a specific rhyme scheme of ABABCDCDEFEFGG. It consists of three quatrains (four-line stanzas) and a concluding couplet (two-line stanza) at the end.

On the other hand, a Petrarchan sonnet follows a different structure. It consists of an octave (eight-line stanza) with a rhyme scheme ABBAABBA, followed by a sestet (six-line stanza) with a rhyme scheme that can vary (commonly CDCDCD or CDECDE).

Using this understanding of the two sonnet forms, it is clear that the correct answer to the question is:

An English sonnet contains a couplet.

I agree.