单选题 The experience of dealing with a clamorous band of younger siblings, earning their affection while holding them to their tasks, can prove remarkably______in later years when one deals with______colleagues jealous of their prerogatives.

• (A) useful… fractious
• (B) trenchant … ambitious
• (C) deep-seated … difficult
• (D) prophetic… envious
• (E) truculent… unruly