Explanation:

- In the passage, Sandra mistakenly approaches a woman she thinks is her friend.

- She apologizes for the mistake when she realizes it's not Sandra.

- The woman's appearance is surprising and reminds her of a fairy-tale witch.

- Before she knows what's happening, the woman has taken her purse and fled.

- Option 1: "was snatching" – This implies an ongoing action in the past, which doesn't fit well with the sudden and complete action described.

- Option 2: "snatch" – This is the present tense, which doesn't match the past events of the story.

- Option 3: "snatched" – This is the past tense, which appropriately describes the completed action of taking the purse.

- Option 4: "snatches" – This is present tense and doesn't match the tense of the narration.