The correct answer is (a) Deposits.
Deposits form the highest share in household savings in India. This is because deposits are a safe and liquid investment option, and they offer a higher rate of return than currency. Additionally, deposits are protected by the Deposit Insurance and Credit Guarantee Corporation (DICGC), which means that depositors are guaranteed up to Rs. 5 lakh in case the bank fails.
Currency is a less popular investment option than deposits because it is not as safe or liquid. Currency is also subject to inflation, which means that its value decreases over time.
Physical assets, such as gold and real estate, are also popular investment options in India. However, they are less liquid than deposits and they are more volatile in value.
Shares and debentures are also investment options, but they are more risky than deposits. Shares and debentures are subject to market risk, which means that their value can go up or down.
In conclusion, deposits form the highest share in household savings in India because they are a safe, liquid, and relatively high-return investment option.