请教gwd 语法题 谢谢大侠

1.Although improved efficiency in converting harvested trees into wood products may reduce harvest rates,it will stimulate demand by increasing supply and lowering prices ,thereby boasting sunsumption

key : in converting  harvested trees into wood products may reduce harvest rates,demand will be stimulated because of increasing supply and lowering price,which boost

我觉得应该选a 答案也没错啊 请nn 帮忙分析一下

2.Emily Dickinson's letters to Susan Huntington Dickinson were written over a period beginning a few years before Susan's marriage to Emily's brother and ending shortly before Emily's death in 1886 ,outnumbering her letters to anyone else .

key: Dickinson,which were written over a period beginning a few years before Susan's marriage to Emily's brother and ending shortly before Emily's death in 1886 ,outnumber

我觉得a也可以 nn帮忙