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.'

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).'

The given sentence has an error which has been underlined. Select the option that rectifies the spelling error: 'She vaccillates a lot while making any decision.'