Which is the best option that fits gap 23?

Directions: Read the paragraph and answer the questions.

One might think of an ocean as a bottomless sink but its capacity as (21) receptacle for wastes is limited. Oceanic pollution is caused by ship generated discharges of oil and petroleum products, noxious liquids, packaged dangerous goods, garbage etc.

The fate of the pollutant is determined by oceanic currents and the (22) turbulence of the sea. Migrating birds caught in the oil slicks --------23--------their power of flight. Employment of detergents to clean the oil slicks ---------24-----to be harmful to marine life. Paper wastes and cellulose are non- biodegradable in the oceans and their presence affects light penetration as a result of which marine phytocomposition takes place.