Task: Question Answering
Input (English): Problem: abcd is a parallelogram. bd = 2. the angles of triangle bcd are all equal. what is the perimeter of the parallelogram ?
Options: ['a. 12', 'b. 9 √ 3', 'c. 9', 'd. 8', 'e. 3 √ 3']
Output (English): d