$1^{st}$ statement should be - A $\underline{prune}$ is a dried plum.
$2^{nd}$ statement - He was lying $\underline{prone}$ on the floor.
means He was lying on the floor in a prone position.
prone position is a position of the body lying face down
$3^{rd}$ statement - People who eat a lot of fat are $\underline{prone}$ to heart disease.
Here prone means likely or liable to suffer from
∴ The answer will be D) ii) & iii) only