The international treaty of Montreal protocol become effective in the year of

Options

A. 1989
B. 1999
C. 1889
D. 1987

Answer

To determine the year when the Montreal Protocol became effective, we can follow these steps:

### Step 1: Identify the Purpose of the Montreal Protocol
The Montreal Protocol is an international treaty aimed at protecting the ozone layer by phasing out the production and consumption of substances that deplete it, such as chlorofluorocarbons (CFCs).

**Hint:** Look for the main goal of the treaty to understand its significance.

### Step 2: Find the Signing Date
The Montreal Protocol was signed on September 16, 1987. This date marks the formal agreement between the participating countries to work towards reducing ozone-depleting substances.

**Hint:** Remember the signing date as it is crucial for understanding the timeline of the treaty's implementation.

### Step 3: Determine the Effective Date
The treaty became effective on August 26, 1989. This means that the provisions of the protocol were officially put into action from this date.

**Hint:** Focus on the effective date to answer the question accurately.

### Step 4: Analyze the Options
The options provided are:
- 1989-1999
- 1889-1987

Since the protocol became effective in 1989, we can eliminate the other options.

**Hint:** Cross-reference the effective date with the options given to find the correct answer.

### Conclusion
The Montreal Protocol became effective in the year **1989**.

**Final Answer:** 1989