The correct answer is: E. No error
The sentence is grammatically correct. The subject and verb agree in number, and the sentence is complete. The word “also” is used correctly to add information to the sentence.
The sentence could be improved by adding more detail. For example, we could say: “The basket of apples, sent by the gardener, contained a number of green mangoes, as well as some oranges and pears.” This would give the reader a better idea of what was in the basket.
We could also change the order of the words in the sentence. For example, we could say: “A number of green mangoes were also contained in the basket of apples, sent by the gardener.” This would make the sentence more concise.
Overall, the sentence is grammatically correct and does not need any changes.