It was an allusion to what the scientist thought was an inappropriate distribution of funds for stem cell research.
【正确答案】
A
【答案解析】本题中，allusion的意思是“提及”。A项reference“提及”符合题意，如：to make references to the heroic deeds(提到英雄事迹)。其他三项contradiction“矛盾”，explanation“解释”，rejection“拒绝”都不正确。