Dеclarе a two-dimеnsional array of doublеs (on thе stack) namеd tickеrvaluеs with 12 rows and 31 columns

double tickerValues[12][31];

Explanation:

The above written statement declares an array of double with 12 rows and 31 columns on the stack memory.The declaration is in C++ language.

I have not initialized the array as it is just the declaration to initialize it we have use loops or specify  every element by yourself.

To declare it on the heap memory you have to use new keyword.

D) polymorphism