In the following sentence, one numbered part contains a grammatical error. Identify the incorrect part, or choose option 4 if the sentence has no error: 1) Every conceivable race and nationality 2) had its shared of suffering 3) in the world wars 4) No error.

Introduction / Context:
This question tests your ability to locate a basic grammar error inside a long sentence that has been divided into numbered parts. Such questions are very common in competitive English exams because they check both comprehension and knowledge of standard usage in one shot.

Given Data / Assumptions:
The sentence is presented in four numbered parts as follows. Part 1 is Every conceivable race and nationality. Part 2 is had its shared of suffering. Part 3 is in the world wars. Part 4 represents the choice No error. The instruction says that exactly one part has an error, and the other parts are grammatically acceptable in normal written English.

Concept / Approach:
The key concept here is correct noun form after a possessive pronoun. After words like its, his, her, my, our and their, we normally use a noun, not a past participle. We also need to check subject verb agreement, tense, prepositions, and overall sentence sense. The phrase world wars is a standard historical reference that can be accepted without change. Therefore the most promising place to look for an error is the unusual phrase its shared of suffering.

Step-by-Step Solution:
First, read the complete sentence mentally as: Every conceivable race and nationality had its shared of suffering in the world wars.Second, check part 1. The phrase Every conceivable race and nationality is grammatically correct and nicely emphasises that all groups suffered.Third, check part 2. The word shared here is in the past form, but the structure requires the noun share after the possessive pronoun its. The correct phrase is had its share of suffering, not had its shared of suffering.Fourth, check part 3. The preposition in the world wars is appropriate and idiomatic, and there is no error of tense or agreement here.Fifth, once we have isolated the clear error in part 2, we select option 2 as the answer rather than No error in part 4.

Verification / Alternative check:
Replace the incorrect word shared with share and read the sentence again. Now it becomes Every conceivable race and nationality had its share of suffering in the world wars. This is a standard, natural sentence in English. No other changes are required. Since only part 2 needs correction and the meaning now becomes smooth and clear, our choice is confirmed.

Why Other Options Are Wrong:
Option 1 refers to the phrase Every conceivable race and nationality. This part is grammatically fine and expresses a wide range of groups, so it is not the error. Option 3 refers to in the world wars, which is the normal way to describe suffering during those conflicts, so this part is also correct. Option 4 represents No error, but we have already found a definite grammatical error in part 2, so No error cannot be chosen.

Common Pitfalls:
Many learners rush through error spotting questions and focus only on obvious subject verb agreement issues, overlooking subtler mistakes in word form. Another common mistake is to be carried away by overall meaning and ignore the exact grammar of each part. Some candidates also confuse share and shared because they sound similar, but their roles in the sentence are very different. Careful attention to the function of each word in the structure is essential for accuracy in this type of question.

Final Answer:
The incorrect part is 2, because the phrase should be had its share of suffering, not had its shared of suffering.