requesting assistance on a finance question

Use at least one example for each question.
If puts and calls are not complementary in pricing, what does it mean?
a.The market data is skewed
b.An arbitrage opportunity is available
c.Dividends were paid on stocks
d.A black swan event took place
Which of the following is assumed by the Black-Scholes-Merton model?
A.The return from the stock in a short period of time is lognormal
B.The stock price at a future time is lognormal
C.The stock price at a future time is normal
D.None of the above