Excerpt from the idiot
fyodor dosoevsky

"the morning was so damp and misty that it was only with great difficulty that the day succeeded in breaking; and it was impossible to distinguish anything more than a few yards away from the carriage windows."

"the morning was so damp and misty that it was only with great difficulty that the day succeeded in breaking; and it was impossible to distinguish anything more than a few yards away from the carriage windows."

when the author says that "it was only with great difficulty that the day succeeded in breaking," he means that

a) the morning sun rose so bright that it hurt the two men's eyes.
b) the sunlight never appeared on this very misty and cold morning.
c) it was very hard for the morning sun to pierce through gray mist.
d) the two men were very depressed by the lack of sunlight in the train.