What is likely to be an individual's single biggest asset?

A. Their automobile

B. Their jewelry

C. Their bank account

D. Their home

Let's think about a typical person possessing some jewelry, home and a car - their hope is typically the most expensive of those (it also makes sense, since it's the one that's the hardest to be stolen).

Also, people more typically invest in property rather than keep the money on the account - so the correct answer is d)