Explanation:

- The sentence highlights that the eldest sister received the largest part of her father's property. In the idiom "the lion's share," the focus is on receiving a significant majority or the largest portion of something.

- Option 1: the largest portion: This is the correct meaning of the idiom. It refers to the largest part or the majority of something.

- Option 2: the smallest part: This would mean she received very little, which is not the implication of the idiom.

- Option 3: no portion at all: This suggests she received nothing, which is the opposite of "lion's share."

- Option 4: the entire amount: This implies getting everything, which can sometimes overlap with "lion's share," but the idiom usually means the largest portion, not necessarily the whole.