The reporter has written___articles about air pollution hopi

The reporter has written___articles about air pollution hoping to call the attention of all people
to the problem.
为什么选择a series of

a series of一系列的
其他选项呢?
再问： a series of agreat deal with a plenty of a alarge amount of 的区别
再答： 应当是a great deal of（不是with） plenty of（没有a） a alarge amount of 仅用于不可数名词