Which of the following is an Adverb clause of reason?

• ক Provided that you arrive on time, we can start the meeting as planned.
• খ As it was raining heavily, we canceled the picnic. ✅ সঠিক উত্তর
• গ Though he was tired, he continued working late into the night.
• ঘ He worked overtime in order that he could save more money.