Error Spotting – Choose the part (A–D) that contains the grammatical error, or choose No error if the sentence is fully correct. Sentence (parts correspond to options below): A) The basket of apples B) sent by the gardener C) contained a number of D) green mangoes also.

Introduction / Context:
The item assesses adverb placement (also) and end-focus in declarative sentences. English prefers also either before the lexical verb or immediately after the subject when it modifies the entire predicate.

Given Data / Assumptions:

• Subject: The basket of apples (singular)
• Verb: contained
• Direct object: a number of green mangoes
• Focus adverb: also

Concept / Approach:
Sentence adverbs like also usually appear before the main verb (also contained) or after the subject (The basket of apples also …) when the intention is additive meaning for the predicate. Placing also at the very end after the object is less idiomatic and can miscue scope.

Step-by-Step Solution:

Verification / Alternative check:
Read both versions aloud. The end-placed also sounds tacked on; placing it before contained yields a smoother, standard rhythm and scope.

Why Other Options Are Wrong:

• A) Correct head noun with of-phrase; number agreement is with basket, which is fine.
• B) Past participle sent properly forms a reduced relative clause.
• C) a number of correctly takes a plural noun (green mangoes).

Common Pitfalls:
Overusing clause-final also leads to ambiguity. Prefer also contained or also after the subject for clarity.

Final Answer:
Option D is the error. Rewrite as: The basket of apples also contained a number of green mangoes.