سوال ۳ کنکور ارشد مهندسی کامپیوتر ۱۴۰۵

The sentence describes gathering together the complete works of many poets in one library, so the verb must mean "to bring/gather together into one place." That is exactly collected (option 3): She has collected in her library the complete works...

Why the others fail:

• defended — to protect from attack; makes no sense with "works ... in her library."
• arrived — intransitive ("arrived at"); it cannot take the direct object the complete works.
• caused — to make something happen; you do not "cause works in a library."

Exam trick: Test transitivity. arrived is intransitive and cannot govern the object "the complete works," which alone eliminates option 2 before you even weigh meaning.