Final answer:
Nestlé used the management function of (A) planning to solve the problem with its chocolate bars not being suitable for the Indian markets.
Step-by-step explanation:
The management function that Nestlé used to solve the problem of its chocolate bars not being suitable for the Indian markets is planning.
Nestlé identified the issue of the chocolate bars melting in direct sunlight and realized they needed to come up with a different product that could withstand these conditions. They then developed the innovation strategy to create Chocostick, a liquid chocolate that could be consumed in hot climates without melting or becoming messy.
By planning and implementing this innovation strategy, Nestlé successfully solved the problem and created a popular product for the Indian market.