【英语】请教一下有关not universally的表意问题

【英语】请教一下有关not universally的表意问题
A tall tree can transport a hundred gallons of water
a day from its roots deep underground to the treetop.
Is this movement propelled by pulling the water from
above or pushing it from below?The pull mechanism
has long been favored by most scientists.First
proposed in the late 1800s,the theory relies on a
property of water not commonly associated with
fluids:its tensile strength.Instead of making a clean
break,water evaporating from treetops tugs on the
remaining water molecules,with that tug extending
from molecule to molecule all the way down to the
roots.The tree itself does not actually push or pull; all
the energy for lifting water comes from the sun’s
evaporative power.
原文里有这么一句话：“The pull mechanism has long been favored by most scientists”
然后紧接着的一道题：
Which of the following statements is supported by
the passage?
A.The pull theory is not universally accepted by scientists.
答案说这个选项是正确的,可是文章不是说了pull mechanism已经被大多数科学家接受了么,那这个选项为什么不是错的呢?
全文我已经列在上面了,可以参考下