Fossil formation is a complex process and needs certain conditions and circumstances to be met in order to form a fossil.
The answer to your question is b.)
I would suggest November but it actually depends on where you live (a spring month would be good for most states)
The answer I believe would be D) 75 - 79.
Hope this helps.
Water leaves a lake through the ground. "Ground water is recharged from rain water and snowmelt or from water that leaks through the bottom of some lakes and rivers," - Google
Sorry if my answer was incorrect.