How is pahoehoe lava different from pillow lava? how are they similar

Phosphodiesterases (PDEs) are a superfamily of enzymes that degrade cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP). There are now 11 PDE families identified, many of which exist as splice variants.

https://www.creative-biogene.com/Services/Drug-Discovery-Services/PDE-Screening-Assays.html

Explanation:

b is dominant over the allele for the white fur.

the answer is definitely a