Concept:To dampen something (such as spirits, hopes or enthusiasm) means to make it less strong or to reduce it.Solution:"Dampen our spirits" means to make us less cheerful or less enthusiastic, that is, to lower our spirits."Suppress" means to hold back or put down by force; "break" and "destroy" mean to ruin completely. These are much stronger than dampen, which only means to reduce.Answer:Option D (lower)