Cause and Effect Analysis

The problem asks us to identify the most probable cause for a given effect.

The Effect: In recent years, a very large number of seats in engineering colleges have remained vacant.

We need to evaluate which of the given options provides the most logical reason for this recent trend of decreased demand for engineering education.

Evaluating the Options

A. There has been a considerable decrease in hiring of engineering graduates due to economic slowdown in the recent years.

• Analysis: If the job market for engineers is shrinking, the primary incentive for pursuing an engineering degree (a stable, well-paying job) is diminished. A decline in post-graduation employment opportunities would directly and logically lead to fewer students enrolling in engineering programs. This aligns perfectly with the effect of vacant seats.
• Conclusion: This is a very probable cause.

B. Students have always preferred to complete graduation in three years time instead of four years for engineering.

• Analysis: The effect is a recent trend ("in recent years"). A long-standing preference ("have always preferred") cannot explain a new phenomenon.
• Conclusion: This is not a probable cause.

C. The govt. has recently decided to provide post qualification, professional training to all engineering graduates at its own cost.

• Analysis: Government-funded training would make an engineering degree more valuable and attractive to students. This would likely increase demand and lead to fewer vacant seats, which is the opposite of the observed effect.
• Conclusion: This is not a probable cause.

Final Conclusion

The most logical and probable cause for a decrease in engineering admissions is a decrease in the hiring of engineering graduates. Therefore, option A is the correct answer.