Which would have the lowest input force?
A short lever with a large fulcrum
A long lever with the fulcrum as far as possible from the load
A Short lever with the fulcrum as close as possible to the load
A long lever with the fulcrum as close as possible to the load

A long lever with the fulcrum as close as possible to the load

Explanation:

If F be the effort , W be the weight , L₁  be the distance of load from fulcrum and L₂ be the distance of effort from the fulcrum ,

Taking moment of force about the fulcrum , we have

W x L₁ =  F x L₂

F = W x ( L₁ /  L₂ )

F will be minimum when L₁ will be minimum .

Hence  fulcrum should be as close as possible to the load.

answer carbon and three oxygen atoms;