If A and B are two events such that `P(A)!=0`and `P(B | A) = 1`; then(A) `AsubB` (B) `BsubA` (C) `B=varphi` (D) `A=varphi`

Explanation

To solve the problem, we need to analyze the given conditions and determine the relationship between events A and B based on the provided probabilities.

### Step-by-Step Solution:

1. **Understanding the Given Information**:
We know that:
- \( P(A) \neq 0 \) (the probability of event A is not zero).
- \( P(B | A) = 1 \) (the probability of event B given event A is 1).
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