From which date did the Supreme Court of India ban the sale of BS III compliant vehicles in the country?

Introduction / Context:
To reduce vehicular pollution, India has gradually tightened emission norms, moving from Bharat Stage three to Bharat Stage four and beyond. A significant policy decision was the Supreme Court order banning the sale of BS three compliant vehicles from a specific date. This question tests recall of that key date.

Given Data / Assumptions:

- The question refers to the ban on sale of BS three vehicles by Supreme Court order. - Four dates in the year twenty seventeen are given as options. - We know that Bharat Stage four norms were to come into force from a particular date.

Concept / Approach:
The Supreme Court ordered that no BS three compliant vehicles could be sold in India from April one, twenty seventeen, when Bharat Stage four norms came into effect across the country. This order applied to both two wheelers and four wheelers and forced manufacturers and dealers to clear BS three stocks before that date. Therefore, the correct answer is April one, twenty seventeen.

Step-by-Step Solution:
Step 1: Recall that Bharat Stage four emission standards became mandatory from the beginning of the financial year twenty seventeen to twenty eighteen. Step 2: Note that in India financial years start on April one, making that date significant for regulatory changes. Step 3: Remember news coverage showing last minute discounts and sales of BS three vehicles before the cut off date and the ban starting immediately after it. Step 4: Compare options and see that April one, twenty seventeen matches both the financial year start and the known implementation date for BS four norms. Step 5: Select April one, twenty seventeen as the correct date.

Verification / Alternative check:
Newspaper reports and government notifications from that period clearly state that from April one, twenty seventeen, only BS four compliant vehicles could be sold, following the Supreme Court decision. Many exam guides discuss this in environment and economy sections, confirming the same date. Checking multiple sources removes doubt about the correct choice.

Why Other Options Are Wrong:
October two, twenty seventeen corresponds to Gandhi Jayanti and is sometimes used for launching campaigns, but it is not the BS three cut off date. May one, twenty seventeen is Labour Day in many countries but was not fixed for this emission norm transition. June one, twenty seventeen is also not mentioned in official documents regarding the BS three sale ban.

Common Pitfalls:
Students may recall that the change happened in twenty seventeen but confuse the exact month. Another pitfall is mixing up the date for BS four implementation with later announcements about BS six. A good strategy is to remember that major tax and regulatory changes often align with the start of the financial year on April one.

Final Answer:
The Supreme Court ban on the sale of BS three compliant vehicles took effect from April 1 2017.