The core concept is understanding the meaning of 'diluted' in the context of concentration or intensity. The term suggests a reduction in strength. * **Correct Answer:** B. 'Weakened in strength' accurately describes the effect of dilution, which implies the substance has been made less potent. * **Incorrect Options Analysis:** * A. 'More concentrated' is the opposite of diluted; it implies an increase in potency. * C. 'Completely gone' is an extreme case, while dilution indicates a reduction, not elimination. * D. 'Chemically changed' implies an alteration of the substance's composition, whereas dilution focuses on a decrease in concentration. **Key Point**: Understanding that 'diluted' implies a decrease in concentration is crucial. The prefix 'di-' suggests a separation or weakening. **Common Misconception**: Students may confuse diluted with destroyed, or with an actual chemical change to the compound.