Why are very high temperatures and pressures required for fusion to occur?

B)to overcome the repulsion between the protons in the nuclei that join  

Fusion is basically the fusion of two hydrogen atoms. Now the nucleus of the hydrogen has protons. The protons are positively charged. When you bring two protons together, what happens? They will repel. To overcome this repusion high temperature is needed. Also the atoms of the hydrogen have to be close to each other to effectively fuse.

Explanation:A, C and D all relate to fission, not fusion.

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B.) to overcome the repulsion between the protons in the nuclei that join

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they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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