1. The T helper cells also activate B cells , which are then in the presence of these antigens , causing the production of autoantibodies .
2. T helper cells then activate B cells , which are also in the presence of these antigens , which causes the production of autoantibodies .

Select your answer from the options. Are these two sentences paraphrases of each other?
Choose from: (i) no. (ii) yes....I think the answer is
(i)