Alisha finds it difficult to swim for 1500 m, but she walks the same distance easily because the interparticle force between particles of air is that of water.
The correct option is A less than The particles of air (gases) have a large space between them and the interparticle force of attraction is very low. We move through these particles while walking. Thus, it does not require a lot of effort to push the particles apart. Water molecules have relatively greater interparticle force and less interparticle space than air. Thus, swimming requires a lot of force to push the water molecular apart and make space between them for our body.