Laurie told her friend Sandi, "I had a headache this morning so I used an old family cure: Three sips of ginger ale, and an hour later my head felt better." Sandi replied, "I am glad you are feeling more comfortable now, but maybe the sheer passage of time made your headache go away." Sandi is offering a(n) in response to Laurie's explanation.
a) rival hypothesis
b) causal correlation
c) falsifiable pretext
d) extraordinary claim