Endothermic processes absorb heat from surroundings.

Steps:

• Recall endothermic reactions absorb energy, increasing enthalpy (ΔH > 0).
• Classify processes: combustion releases heat (exothermic); cracking breaks bonds using heat (endothermic); photosynthesis uses light/heat to form glucose (endothermic); respiration releases energy as heat (exothermic); fermentation releases energy (exothermic).
• Identify pairs: only cracking and photosynthesis both require energy input.
• Confirm option C matches this pair.

Why C is correct:

• Cracking and photosynthesis both absorb energy to break/form bonds, per ΔH > 0 definition for endothermic reactions.

Why the others are wrong:

• A: Combustion is exothermic (ΔH < 0), releasing heat.
• B: Both combustion and fermentation are exothermic, releasing energy.
• D: Respiration is exothermic (ΔH < 0), while photosynthesis is endothermic.

Final answer: C