On the Psychrometric Chart, a Simple Heating Process (No Humidification

Multiple Choice

On the psychrometric chart, a simple heating process (no humidification or dehumidification) appears as a line that is

A) horizontal to the right,
B) horizontal to the left,
C) vertical upward,
D) diagonal upwards to the right (NE direction)
E) diagonal downwards to the right (SE direction)