Crypto asset manager Grayscale Investments is advocating for the U.S. Securities and Exchange Commission (SEC) to approve options trading on its Bitcoin (CRYPTO: BTC) ETF, aiming to diversify its investor base. What Happened: Grayscale CEO Michael Sonnenshein recently highlighted the importance of granting options on the Grayscale Bitcoin Trust (OTC: GBTC) arguing that a denial would unjustly affect its shareholders, Reuters reported. This plea comes despite the SEC’s history of approving options for ETFs linked to Bitcoin futures. “It is vital to the interests of GBTC and all spot Bitcoin [ex…