登录之后可查看解析

B is corrent. An offeree cannot accept an offer unless the offeree knows of the existence of the offer; otherwise there is no objective meeting of the minds. Farber does not know of the increase of the monetary award to $500, and submitted his suggestion as an acceptance to the terms of the offer of which he knew (i.e., the $100). Even though Water Works later raised the amount and will use the suggestion in the later period, Farber only has a right to receive $100.
A is incorrect. An offeree cannot accept an offer unless the offeree knows of the existence of the offer.
A is incorrect. An offeree cannot accept an offer unless the offeree knows of the existence of the offer.
D is incorrect. Water Works’ offer was not gratuitous; it was a manifestation of an intent to enter a contract. The offer was definite and certain and possessed the requisite essentials to make it operative; therefore, Water Works must perform its promise of remuneration for Farber’s accepted and used suggestion.