A Stock Is Currently Trading at $100 $u = 1.10$ Or Fall by a Factor Of

Multiple Choice

A stock is currently trading at $100. In each month, the stock will either increase in price by a factor of $u = 1.10$ or fall by a factor of $d = 0.90$ . The risk-free rate of interest per month is 0.1668% in simple terms, i.e., an investment of $1 at the risk-free rate returns $1.001668 after one month. What is the early-exercise premium of a 100-strike, six-month American put option?

A) $0.15
B) $0.17
C) $0.89
D) $1.12