Four spellings of the same English word are given below. Out of the four alternatives, choose the correctly spelt word corresponding to the military term meaning “exploration of an area”.

Introduction / Context:
This spelling question focuses on the word commonly used in military and strategic contexts: “reconnaissance”. It refers to the act of exploring an area to gather information, often for military or security purposes. Accurate spelling of such technical terms is frequently tested in competitive exams, particularly in sections dealing with vocabulary and usage.

Given Data / Assumptions:

• The target word relates to exploration for information, especially military exploration.
• All options are variants of the same word with slightly different sequences of letters.
• We need the standard dictionary spelling.
• The correct spelling should be widely recognized in formal English.

Concept / Approach:
The correct spelling is “reconnaissance”. The word has French origins, which is why it contains a double “n” and double “s”. It is easy to make mistakes with the number and placement of these consonants. The approach is to recall the correct sequence “re-con-nai-ssance” and identify the option that preserves this pattern exactly: RE + CON + NAISS + ANCE → RECONNAISSANCE.

Step-by-Step Solution:
Step 1: Break the word into parts: “re” + “con” + “nais” + “sance”. Step 2: Note the double “n” and double “s” in the central portion: “nnaiss”. Step 3: Compare each option to this reference. Step 4: Option “RECONNAISSANCE” correctly includes both double “n” and double “s” and ends with “ance”. Step 5: All other options either omit a consonant, add extra letters, or change the sequence.

Verification / Alternative check:
You can verify by recalling familiar phrases such as “reconnaissance mission”, “aerial reconnaissance”, or “reconnaissance report”. In all standard sources, including textbooks and newspapers, the spelling is “reconnaissance”. Searching your memory for how it appears in print will usually bring up the double “n” and “ss” pattern, confirming that option “RECONNAISSANCE” is correct.

Why Other Options Are Wrong:
“RECONAISSANCE” is missing an “n” and therefore does not show the correct “nnaiss” sequence.
“RECCONAISANCE” adds an extra “c” and still fails to keep the proper arrangement of double “n” and “ss”.
“RECONNAISANCE” drops one “s”, which is incorrect in the standard spelling.
“RECONNAISSENCE” changes the ending from “-ance” to “-ence”, which is not the accepted form for this word.

Common Pitfalls:
Many learners confuse “-ance” and “-ence” endings or misplace double consonants in words of French origin. Another typical error is to oversimplify the spelling by removing one of the doubled letters. To avoid such mistakes, it is helpful to remember the word visually as “re-con-naiss-ance” and to see it in context, such as “reconnaissance mission”. Regular exposure to quality reading material will gradually strengthen your spelling of such specialized terms.

Final Answer:
The correctly spelt word is “RECONNAISSANCE”.