Earth Hour is a global environmental campaign in which people switch off non essential lights for one hour. The chosen date for the observance of Earth Hour in the year 2017 was which of the following?

Introduction / Context:
Earth Hour is an annual worldwide event organised by environmental groups to raise awareness about climate change and energy conservation. During Earth Hour, households, businesses and landmarks switch off non essential lights for one hour. Many general knowledge questions ask about the specific dates on which Earth Hour has been observed in different years. This question refers to Earth Hour in the year 2017.

Given Data / Assumptions:
• The year mentioned is 2017. • Options list 25th, 26th, 27th and 28th March. • The event is Earth Hour, held in late March each year. • We assume worldwide coordination of the date for that year.

Concept / Approach:
Earth Hour is generally organised on a Saturday towards the end of March. For 2017, the globally chosen date for Earth Hour was 25 March 2017. Many current affairs compilations from that year mention this date and emphasise that lights were switched off between 8.30 pm and 9.30 pm local time. The task here is to recall that date and match it to the correct day listed in the options.

Step-by-Step Solution:
Step 1: Remember from current affairs that Earth Hour 2017 took place in the last week of March. Step 2: Note that, according to reports and quiz books, the exact date was 25 March 2017. Step 3: Compare the options and see that only option A lists 25th March. Step 4: Options B, C and D list 26th, 27th and 28th March, which do not match the documented date of the event. Step 5: Select 25th March as the correct answer.

Verification / Alternative check:
Looking at newspapers and online current affairs archives from that period, we find that Earth Hour 2017 was indeed observed on the evening of Saturday 25 March 2017. Many quiz questions framed after the event use exactly the same options and mark 25 March as correct. No alternative date is mentioned for that year official observance.

Why Other Options Are Wrong:
Option B: 26th March is one day later than the actual Earth Hour date for 2017 and does not align with official announcements. Option C: 27th March is also incorrect as Earth Hour has never been reported to have taken place on this date in 2017. Option D: 28th March is too late in the month and does not match the documented schedule of the event.

Common Pitfalls:
Students may remember only that Earth Hour occurs in late March and then pick any date around that time. This often leads to confusion between 25th and 26th March. To avoid such mistakes, it is helpful to link the event to a specific memory phrase such as Earth Hour 2017 equals 25 March and practice with short revision tables for important environmental days.

Final Answer:
The chosen date for the observance of Earth Hour 2017 was 25th March.