Answer:
(B) rights offer
Explanation:
Right offer is an offer made by the company to issue additional capital, but even in this case the company does not take help of public, but rather issues shares to the original shareholders.
In the given case Alberto already holds 2,500 shares and thereafter further he is issued shares, rather than issuing to general public as because he already had shares.
Therefore issue of shares to Alberto will be treated as right offer.