Final answer:
Insufficient information is provided to determine the number of yellow and blue molecules present at t=9.00. Chemistry problems require specific information about the system which is not given in the question.
Step-by-step explanation:
Unfortunately, without more specific information, such as a description of the relevant chemical reaction or conditions at t=9.00 or the starting concentrations or numbers of molecules, the question about the number of yellow and blue molecules cannot be accurately answered. Chemistry often involves reactions that depend on initial conditions, the amounts of reactants, and time-based changes. Calculations might require understanding the dynamics of a chemical reaction, the stoichiometry involved, or kinetic data, none of which has been provided. A critical part of understanding and solving chemical problems involves having complete information about the system in question. Therefore, we cannot select an answer amongst options A, B, C, and D without additional context.