Based on the sentence above, we could say that the it contains a compound subject. Compound subject is define as noun or pronoun that engaged in the activity of the verb. So, since the sentence uses the word "and" it makes makes "Gina and Sydney" a compound subject
Tbh, I don't know what it means, but Google does
GOOGLE: Lipophilicity, refers to the ability of a chemical compound to dissolve in fats, oils, lipids, and non-polar solvents such as hexane or toluene. Such non-polar solvents are themselves lipophilic, and the axiom that "like dissolves like" generally holds true
MORE GOOGLE: Lipophilicity is defined as the affinity of a drug for a lipid environment. ... Lipophilicity can be measured by the distribution of a drug between the organic phase, which is generally n-octanol pre-saturated with water, and the aqueous phase, which is generally water pre-saturated with n-octanol
I hope this helps! Good luck!
The answer for this question is B. Is