Which launch vehicle was used by ISRO in 2017 to successfully place a record 104 satellites into orbit in a single mission?

Introduction / Context:
The Indian Space Research Organisation (ISRO) has set several records in space technology. One of the most celebrated missions was when ISRO launched 104 satellites in a single flight, which gained worldwide attention. Competitive exams often ask which rocket and specific mission number achieved this feat. This question checks awareness of that record breaking launch.

Given Data / Assumptions:

- The mission is described as the successful launch of 104 satellites in one go.- The options list four Polar Satellite Launch Vehicle (PSLV) mission codes: C37, C36, C39, and C38.- We assume basic knowledge of ISRO launch vehicle names and mission designations.

Concept / Approach:
ISRO uses the PSLV rocket for many of its satellite launches. Each mission is given a code such as PSLV C36, PSLV C37, and so on. The specific mission that carried 104 satellites, including the primary Cartosat 2 series satellite and many smaller satellites, was PSLV C37. Therefore, selecting the correct mission code requires recalling that number from news and general knowledge study materials.

Step-by-Step Solution:
1. Remember that the record of launching 104 satellites at once was set by an Indian PSLV mission in February 2017.2. Identify which mission code is linked to that launch. Standard references name PSLV C37 as the mission that achieved this record.3. Compare with other options: PSLV C36 and PSLV C38 were other missions in the sequence but did not carry 104 satellites, and PSLV C39 was known for a later mission with a different outcome.4. Confirm that only PSLV C37 matches the description of the record setting mission.5. Choose PSLV C37 as the correct answer.

Verification / Alternative check:
A memory check can be done by recalling that many news headlines specifically mentioned “PSLV C37” and the number 104 together. Visuals often showed the rocket lifting off from Sriharikota and articles highlighted that it broke the previous record for most satellites launched in a single mission. Since no other PSLV code is commonly paired with the 104 satellite record, this serves as strong confirmation that PSLV C37 is correct.

Why Other Options Are Wrong:
- PSLV C36: This was a different PSLV mission that did not involve launching 104 satellites.- PSLV C39: This mission is remembered for a launch failure involving a satellite, not for the multi satellite record.- PSLV C38: Another PSLV mission that placed several satellites in orbit but not the record breaking 104.

Common Pitfalls:
Exam takers sometimes confuse the mission numbers because they are close to one another and appear in chronological order. Some may remember only that PSLV was used and forget the specific code. A good study strategy is to associate unique achievements with the exact mission labels, such as linking PSLV C37 directly with the phrase 104 satellites, so that the association becomes strong and easy to recall.

Final Answer:
The correct option is PSLV C37, the PSLV mission that successfully launched 104 satellites in a single flight for ISRO in 2017.