The correct answer is: B. 80%
According to the Securities and Exchange Board of India (SEBI), a minimum of 80% of the issued capital must be subscribed in order to validate a public share issue. If this minimum subscription is not met, the issue may be cancelled and may be re-issued on a future date.
The purpose of this requirement is to protect investors from companies that may not be able to fulfill their obligations. If a company is unable to raise the minimum amount of capital, it may not be able to operate successfully and may be forced to go bankrupt. This could result in investors losing their money.
The 80% requirement is a safeguard for investors and helps to ensure that only companies with a good chance of success are able to raise capital through public share issues.
The other options are incorrect because they do not meet the minimum subscription requirement set by SEBI.