For a spontaneous process, which of the following is always true?

Options

A. `DeltaG gt 0`
B. `Delta_("total")S lt 0`
C. `T DeltaS gt 0`
D. `DeltaG lt 0`

Explanation

To determine which statement is always true for a spontaneous process, we need to analyze the conditions for spontaneity in thermodynamics.

### Step-by-Step Solution:

1. **Understanding Spontaneity**:
A spontaneous process is one that occurs without needing to be driven by an external force. In thermodynamics, spontaneity is often assessed using Gibbs free energy (G).

2. **Gibbs Free Energy Equation**:
...