In the following identify the compounds/reaction conditions represented by the alphabets `(A), (B)`, and `( C)` :
`C_(6) H_(5) COOH overset(PCl_5)rarr (A)overset(NH_(3) rarr (B) overset(P_2 O_5)rarr C_(6) H_(5) CN overset(H_2 //Ni)rarr (C)`.

Explanation

To solve the question, we need to identify the compounds and reaction conditions represented by the letters (A), (B), and (C) in the given reaction sequence involving benzoic acid (C₆H₅COOH).

### Step-by-Step Solution:

1. **Identify the starting compound:**
The reaction starts with benzoic acid, which is represented as C₆H₅COOH.

2. **Reaction with PCl₅:**
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