IMO,
A. The growth of new rings in a tree is not a function of levels of precipitation. : Seems irrelevant
B. Only the Brazilian ash loses rings because of excessive heat. : irrelevant. We don't care about other things losing anything because of excessive heat.
C. Only one day of temperatures above 95 degrees Fahrenheit is needed to cause the Brazilian ash to lose a ring: irrelevant. As no information about the time that is
needed to cause the Brazilian ash to lose a ring.
D. The internal rings
...
A. The growth of new rings in a tree is not a function of levels of precipitation. : Seems irrelevant
B. Only the Brazilian ash loses rings because of excessive heat. : irrelevant. We don't care about other things losing anything because of excessive heat.
C. Only one day of temperatures above 95 degrees Fahrenheit is needed to cause the Brazilian ash to lose a ring: irrelevant. As no information about the time that is
needed to cause the Brazilian ash to lose a ring.
D. The internal rings
...




