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Answer: | 
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A)Corporate income is taxed, and then shareholders are
taxed on the corporate dividends they receive. | 
| As
Corporations are deemed to have separate legal existence, distinct
from its shareholders, they are required to pay income -tax on
their earnings ,that are assessed as taxable income, from carrying
on their business. | 
| The
corporations pay dividends to their shareholders, out of the above
after-tax income--- which is again taxed at the sahreholders' hands
at their respective income-tax rate. | 
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This is called double-taxation , with respect to corporate form of
business organisation. | 
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Income tax is paid , two times, on the same income , both corporate
& personal level. | 
| 
Other forms of business organisations such as , | 
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Sole proprietorships & partnerships | 
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pay tax on their business income only once , at the hands of the
owner or the partners. | 
All the other options are not termed Double Taxation.