`CH_3 - overset(O)overset(||)C - OH overset(2RLi)toA , A overset(H_3O^(+))toB`
Identify A and B.

Explanation

To solve the problem, we need to identify the products A and B from the given reaction sequence involving acetic acid (CH₃COOH) and organolithium reagents (2RLi).

### Step-by-step Solution:

1. **Identify the Starting Material:**
The starting material is acetic acid, which has the structure CH₃COOH.

2. **Reaction with Organolithium Reagents:**
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