One advantage of a CONTACT fungicide:

• A. Prone to wash-off
• B. Broad mode of action
• C. Moves systemically in the plant
• D. Can be used with small amounts of water

Answer: (B)

Contact fungicides act on the fungus only where it contacts the treated surface and often attack multiple targets inside the organism. That broad, multisite action is advantageous because it makes it harder for fungi to develop resistance, so the product remains effective against a wider range of fungi and strains. The other statements describe limitations or misconceptions: contact products don’t move systemically in the plant, they’re more dependent on good spray coverage and can be washed off by rain, and using them with small amounts of water isn’t a defining advantage. So the best-fit benefit is the broad mode of action.