Problem:OPTIONS:
- glass
- marble
- crust
- soils
- coal
- sugar
- calcite
- arteries

You are presented with the quiz "What is formed from extreme heat and pressure?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "extreme heat and pressure change rock into metamorphic rock" and "marble is a form of metamorphic rock". So, what's the best answer to the question?
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A: marble

Problem:OPTIONS:
- microscopic
- infected
- huge
- storing water
- giant
- small
- Absorb light
- bioaerosols

You are presented with the quiz "What are zooplankton?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "zooplankton are tiny animals that feed on phytoplankton" and "microscopic animals are called zooplankton". So, what's the best answer to the question?
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A: microscopic

Problem:OPTIONS:
- carbon dioxide
- energy
- electricity
- The atmosphere
- heat energy
- adding heat
- It expands
- kinetic energy

You are presented with the quiz "what does methane produce when burned?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "biofuel is used to produce electricity by burning" and "biofuels include ethanol, methanol, biodiesel, biocrude, and methane". So, what's the best answer to the question?
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A: electricity

Problem:OPTIONS:
- eating
- driving
- survival
- rain
- movement
- farming
- vehicles
- cooking

You are presented with the quiz "What can be water vapor condensing in air be a hindrance to?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fog is formed by water vapor condensing in the air" and "fog When driving, fog is an obstacle or a hindrance that makes things obscure". So, what's the best answer to the question?
****
A:
driving