Correct Option: B

The Ostrich is the largest living species of bird and lays the largest egg of any living bird (extinct elephant birds of Madagascar and the giant moa of New Zealand did lay larger eggs). Ostriches usually weigh from 63 to 145 kilograms, Ostriches of the East African race averaged 115 kg in males and 100 kg in females, while the nominate subspecies was found to average 111 kg in unsexed adults. Exceptional male ostriches (in the nominate subspecies) have been weighing up to 156.8 kg. At sexual maturity (two to four years), male ostriches can be from 2.1 to 2.8 m in height, while female ostriches range from 1.7 to 2 m tall.