Such unhygienic conditions encourage the spread of diseases9/15Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. Question. Such unhygienic conditions encourage the spread of diseases.declinestabilitydecreaseincreaseGiải thíchĐáp án D Spread (lan tỏa) = increase (tăng)