Question

what are the elements that are needed for yeast to proof?
salt, cold temperature, and sugar
warmth, moisture, and sugar
light, oxygen, and flour
fat, salt, and high heat

Explanation:

Yeast is a living organism. It needs warmth (optimal temperature around 37°C or 98.6°F) to activate its enzymes. Moisture is essential as it is involved in the metabolic processes of yeast. Sugar acts as a food source for yeast. Yeast ferments sugar (through anaerobic or aerobic respiration depending on oxygen availability) to produce carbon - dioxide (which causes dough to rise) and other by - products. Salt can inhibit yeast growth if in high amounts (so the first option is wrong). Light is not a requirement for yeast proofing (so the third option is wrong). High heat can kill yeast (so the fourth option is wrong).

Answer:

Warmth, moisture, and sugar.