Answer :
Correct option is A. "charge" most nearly means responsibility
Option A is good to go, as in the context of the passage "during the drive to the Quabarl mansion Lady Carlotta was impressively introduced to the nature of the charge that had been thrust upon her; she learned that Claude and Wilfrid were delicate, sensitive young people, that Irene had the artistic temperament highly developed, and that Viola was something or other else of a mould equally commonplace among children of that class and type in the twentieth century.
As it is explained in the paragraph that while driving to Quabarl mansion she was carrying responsibility towards the Claude and Wilfrid as they are small children, sensitive people.
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