The word, 'whole' means 'all of' or 'entire'.
The word, 'less' means 'a smaller amount of'. It is used before an uncountable noun. However, in the given sentence, the noun (man) is singular and countable. When used in the given sentence, both the words, 'whole' and 'less' do not convey any meaning. Hence, options B and C are incorrect.
The word, 'some' is a determiner which refers to an unspecified amount or number of something. The phrase, 'some man' means 'any man, however, who it is, is unclear'. As the phrase, 'some man' is vague, when it is used in the given sentence, it does not convey any meaning. Hence, option D is incorrect.