4th time posting this question in search of correct answers. included incorrect answers in screenshot. please help! thank you.

The common shares of Twitter, Inc. (TWTR) recently traded on the NYSE for $22.30 per share. You have employee stock options to purchase 1,000 TWTR shares for $21.7 per share. The options expire in three years. Assume that the annualized volatility of TWTR stock is 89.2 percent and that the interest rate is 2.9 percent. (Assume the options are European options that may only be exercised at the maturity date.) a. Is this option a call or a put? Call Put b. Using an option pricing calculator such as the one at erieri.com/blackscholes, estimate the value of your TWTR options. (Round your answer to nearest whole number.) Answer is complete but not entirely correct. Value of your TWTR options $ 13 X c. What is the estimated value of the options if their maturity is six months instead of three years? (Round your answer to nearest whole number.) Answer is complete but not entirely correct. Value of the options 6 X c. What is the estimated value of the options if their maturity is six months instead of three years? (Round your answer to nearest whole number.) Answer is complete but not entirely correct. Value of the options $ 6 X d. What is the estimated value of the options if their maturity is three years, but TWTRs volatility is 63.8 percent? (Round your answer to nearest whole number.) Answer is complete but not entirely correct. Value of the options $ 10 X