Choose the correct sentence?

- অপশনের বাক্যগুলো complex sentence.

• Complex sentence:
- এ ধরনের বাক্য কমপক্ষে একটি independent clause ও dependent clause নিয়ে গঠিত হয়।
- বাক্যে subordinating conjunctions হিসেবে দুইটি finite verb যুক্ত হয়। যা দুইটি unequal part কে সংযুক্ত করে।
• Here is the list of subordinating conjunctions:
- Since, as, when, although, so that, whenever, that, if, though, which, till, while, unless, who, until, why, how, what etc.
Example:
- When he handed in his homework, he forgot to give the teacher the last page.
- বাক্যে When (subordinator), he (subject), handed (finite verb), forgot (finite verb).

- The teacher returned the homework after she noticed the error.
- বাক্যে The teacher (subject), returned (finite verb), after (subordinator), noticed (finite verb).

- Roy and Rahman went to the movies after they finished studying. 
- বাক্যে Roy and Rahman (subject), went (finite verb), after (subordinator), finished (finite verb).

Source: SSC Programme, Bangladesh Open University.