Final answer:
The Feast of First Fruits is celebrated by Jews as a harvest festival, specifically called Shavuot, marking the wheat harvest. Christians celebrate the resurrection of Jesus during a similar time, but the celebrations are distinct and have different religious meanings.
Step-by-step explanation:
During the Feast of First Fruits, Jews celebrate the harvest season, which is related to the agricultural background and traditions discussed in the question's reference material. The correct answer to the given multiple-choice question is A. The harvest season. The Jewish festival that corresponds to this event is known as Shavuot, which marks the wheat harvest in the Land of Israel. Christians, on the other hand, celebrate C. The resurrection of Jesus during Easter coincides with the timing of the Jewish observance of Passover but has a different religious significance.