Relinquish means voluntarily cease to keep or claim; give up.
Ex: he relinquished his managerial role to become chief executive
Abject means (of something bad) experienced or present to the maximum degree.
Ex: his letter plunged her into abject misery
Abdicate means (of a monarch) renounce one's throne.
Ex: in 1918 Kaiser Wilhelm abdicated as German emperor
Defenestrate means throw (someone) out of a window.
Ex: she had made up her mind that the woman had been defenestrated, although the official verdict had been suicide
Valiant means possessing or showing courage or determination.
Ex: she made a valiant effort to hold her anger in check
Thus option (B) is the correct choice.