The correct answer is A. Rs 15.00.
The expected capital gain is the difference between the expected final stock price and the original investment. In this case, the expected final stock price is Rs 85 and the original investment is Rs 70, so the expected capital gain is Rs 15.
Option B is incorrect because the expected capital gain is positive, not negative.
Option C is incorrect because the expected capital gain is Rs 15, not Rs 155.
Option D is incorrect because the expected capital gain is positive, not negative.