That is true. Because you will not comprehend what the sentence/ words are saying, because you only care about getting it written down. So multitasking reading and writing at the same time is not a good idea :)
C. The best plans often come to nothing
The man ignored moving ahead in the freezing cold instead of making camp or not going at all. Hope this helps.
Diminish means that it would disappear or get better.
so. C.