Which is the best example of increasing entropy? a pile of library books is placed in a neat stack on a shelf. a cyclist pedals harder while riding uphill. a deserted field becomes overgrown with weeds. a dining room is cleaned to remove dust.

 A deserted field becomes overgrown with weeds

Explanation: Entropy is the measure of randomness or disorder of a system.

If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to increase and vice versa.

Energy must be used to increase the entropy of the system and thus a deserted field becomes overgrown with weeds , it uses energy and thus the randomness or entropy also increases.

A pile of library books is placed in a neat stack on a shelf has least disorder or  least entropy.

A cyclist pedals harder while riding uphill and thus energy is supplied and the entropy decreases.

A deserted field becomes overgrown with weeds and thus the entropy of the field increases.

A dining room is cleaned to remove dust and thus the disorder is decreasing.

thermal energy is the answer