An integral part of a blowout preventer that serves as the closing element on an open hole, and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the __________.

Correct Answer: Option B — blind ram

Blind rams are a critical component of the blowout preventer (BOP) stack. Unlike pipe rams, which seal around the drill string, blind rams are designed to seal against each other to completely shut off an open hole, effectively isolating the wellbore during emergency well control situations.