Which action is an appropiate immediate response to a flood? a. removing wet clothing b. marking flooodwater levels c. avoding crossing flowing water d. walking, no driving, through water

I'd use answer C.     Answer C presents the greatest danger, although D is a good rule to follow also.  

Explanation:

During times of flood, entering into areas of flowing water can be extremely dangerous.  Often the water does not look as deep or heavy flowing as it is, and therefore, there is an increase risk of danger of death due to drowning.  Even good swimmers may have difficulty navigating flowing flood waters.