Which noun explains the feminine plural subject in yanalnahu?

Zuhayr ibn Abī Sulmā: Mortality, Generosity, Self-Respect and Wisdom of Speech (Verses 53–62)

• Al-sullam (ladder)
• Al-maʿrūf (beneficence)
• Lisān al-fatā (the young man’s tongue)
• Al-manāyā (deaths)