FRM一级模拟自测:Stock gamma

If the current market price of a stock is USD 50,which of the following options on the stock has the highest gamma?
 
a.Call option expiring in 30 days with strike price of USD 50
 
b.Call option expiring in 5 days with strike price of USD 30
 
c.Call option expiring in 5 days with strike price of USD 50
 
d.Put option expiring in 30 days with strike price of USD 30


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