Name the class of hydrides to which `H_(2)O, B_(2)H_(6)`, NaH and `LaH_(3)` belong.

Explanation

To determine the class of hydrides to which \( H_2O, B_2H_6, NaH, \) and \( LaH_3 \) belong, we can classify them based on their bonding characteristics and the type of elements involved in their formation.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- The compounds given are \( H_2O \) (water), \( B_2H_6 \) (diborane), \( NaH \) (sodium hydride), and \( LaH_3 \) (lanthanum hydride).

2. **Classify Each Compound:**
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