Elizabeth bought all the ingredients and then prepared the meal for her grandmother’s 90th birthday party. This is the correct form of the sentence from the above given options
Explanation:
From all the above given sentences only the third options chooses the best because the tense of the sentence is maintained and it does not changes. The past tense is maintained continuously and it is not changed until the end of the sentence.
In the first option it is changed from present to future tense then in the second option it is changed from past to present tense and the fourth option is changed from past continuous to past tense. Tenses are used in sentences to indicate the time in which the action had occurred.
