The main role of banks in the nation’s economy is to
a store, lend, and invest money.
b store, lend, and borrow money.
c store, lend, and distribute money.
d store, lend, and approve money.

The first alternative is correct (A).

Banks play a key role in stimulating the country's economy in all productive and financial sectors. The operating mechanism takes place as follows: these institutions serve as safe places to store the finances of individuals and companies. So, stored is used to lend to other people and companies that need to make investments. In return, lenders receive interest, that is, while lending to banks, they are making an investment.

In short, banks are mediating between savers and borrowers. Savers invest by putting their money in the banks, and borrowers borrow in the form of credit.

what the first or next guys says

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.