Select the correctly spelt English word from the following options.

Introduction / Context:
Spelling based questions present a group of words that look similar but only one matches the standard spelling found in dictionaries and textbooks. Such items test careful observation and familiarity with common vocabulary, including abstract nouns and everyday terms. The word eternity is a frequently used noun in literature and conversation, referring to an endless period of time.

Given Data / Assumptions:
The answer choices include variants that resemble real words such as aerobics, choosers, battered, and eternity. We assume that the candidate has seen at least some of these words correctly written in books or articles. The task is to identify which of the options is spelled exactly according to standard English usage, without extra or missing letters.

Concept / Approach:
To solve spelling questions, it is helpful to silently pronounce each option and then compare the visual pattern with known correct spellings. Arobics seems to be an incorrect variant of aerobics, where the first vowel sequence has been reduced. Chosers appears to omit one o from choosers. Batered looks like a mistaken version of battered, with a missing t. Eternity, however, is a common abstract noun consisting of the root etern plus the suffix ity, and appears in expression like for all eternity. This matches the expected spelling and pattern.

Step-by-Step Solution:
Step 1: Identify arobics as an error because the known word is aerobics, with ae at the beginning.
Step 2: Identify chosers as incorrect since the correct form is choosers with double o.
Step 3: Recognize batered as a wrong form of battered, which normally contains double t after the vowel.
Step 4: Look at eternity and recall its meaning of endless time and its standard spelling e t e r n i t y.
Step 5: Confirm that eternity matches standard usage and select it as the correct answer.

Verification / Alternative check:
If we mentally place these words in short sentences, only eternity appears natural and familiar: The memory will last for eternity. The other words look strange because we usually see them as aerobics, choosers, and battered in written English. This simple context test reinforces the conclusion that eternity is the only correctly spelt option among those given.

Why Other Options Are Wrong:
Option A omits the correct vowel combination and therefore fails to represent the standard form aerobics. Option B leaves out one o and breaks the root choose that appears in chooser and choosers. Option C drops one t from battered, leading to an incorrect consonant pattern. Any additional variant that alters the known structure of a common word is also unsuitable. Examinations demand the exact spelling used in reputable dictionaries, so these altered forms cannot be accepted.

Common Pitfalls:
Learners may rely too heavily on pronunciation and overlook silent letters or double consonants that appear in the written form. Sometimes candidates suspect the correct option because it looks too simple compared to obviously distorted distractors. A good habit is to read a variety of English materials and pay attention to the printed form of words, especially those with prefixes and suffixes. Over time, this visual memory of correct spelling makes such questions quick and reliable to answer.

Final Answer:
The correctly spelt word is eternity.