Parts of the following sentence have been given as options. Select the option that contains a spelling error. 'He did not realise the graveity of the matter and behaved recklessly.'

Which numbered part of the following sentence contains a spelling error? 'Although his argument was well-structured (1), the absence of empirecal data (2) rendered it somewhat specious (3) and unsubstantiated (4).'

Select the option that rectifies the incorrectly spelt word 'acommodated' in the given sentence: 'Most of the students opted for the Aeronautical branch but only forty of them could be acommodated in that branch.'