What does the phrase "taken with a barrel of salt" mean at end of the second paragraph

A．the women could perceive colors when she read words.
B．Russian words may be dull and hard to remember as they are black and brown.
C．simple words are not colorful.
D．German may be easy to remember as they are with strange colors.

A．It is caused by emotional conflict or guilty conscience.
B．It is the acting out of a vivid dream.
C．Somnambulists are asleep during their sleepwalking.
D．It is dangerous to waken a sleepwalker.