I know with my full ability I will not be able to complete the full marathon without injure myself . Mentally I am ready but physically not ! It is a bad time to be out of training particularly triathlon season is beginning in next few months . So , I ' m thinking of doing a half this year ... .

Q with options: Give answer the following question using evidence from the above passage: Why do n't I have my full ability to complete a full marathon this year ?
OPTIONS:
[i] I suffered an injury last year but have been able to practice enough since then ..
[ii] I was injured badly this week and have been unable to practice enough to be ready ..
[iii] I was injured badly last year and have been unable to practice enough to be ready ..
[iv] I suffered an injury this week and have n't been able to practice as much since then ..
[iii]