Choose the complex clause

Since you didn’t give any choices, here are a few examples:

Because my coffee was too cold, I heated up it in the microwave.

Although the man was very wealthy, he was still unhappy.

reasoning from several particular examples to establish a general principle

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.