The correct number of chromosomes in tobacco is 48. Tobacco is an allopolyploid species, which means it has multiple sets of chromosomes originating from different species. Each gamete contains 24 chromosomes, resulting in a total of 48 chromosomes in somatic cells. The other options, 45, 46, and 47, do not reflect the correct chromosome count for tobacco. Option A (45) and Option D (47) are incorrect as they do not represent the known chromosome numbers for tobacco. Option C (46) is the diploid number for humans, not tobacco.

This option suggests that the number of chromosomes in tobacco is 45. Tobacco, being an allopolyploid species, does not have 45 chromosomes. This number is incorrect for tobacco.

This is the correct answer. Tobacco is an allopolyploid species, meaning it has multiple sets of chromosomes. Each gamete has 24 chromosomes, thus the total number is 48 for a somatic cell.

This option suggests that the number of chromosomes in tobacco is 46, which is the diploid number for humans, not tobacco. Tobacco has a different chromosome count due to its allopolyploid nature.

This option suggests that the number of chromosomes in tobacco is 47. This number is incorrect for tobacco, which is an allopolyploid species with a different chromosome count.