For the Purpose of Calculating Dilutive Earnings Per Share,options on Issue

For the purpose of calculating dilutive earnings per share,options on issue are:

A) assumed exercised and converted at the beginning of the period or the date of issue, whichever is latest.
B) assumed dilutive only when it results in an issue of ordinary shares for less than the average market price during the period.
C) assumed dilutive only when it results to an issue of ordinary shares for less than the end-of-period market price.
D) treated similar to a bonus issue.