Explanation:

- The essay was badly researched and contained several platitudes and generalizations.

- "Platitudes" are remarks or statements that are dull, overused, and lack originality.

- Option 1: Incorrect statements

- This suggests statements that are factually wrong, not necessarily unoriginal or overused.

- Option 2: Imprecise comments

- This implies comments that are not clear or specific, but it doesn’t address originality.

- Option 3: Often used and unoriginal ideas

- This meaning aligns closely with "platitudes" because platitudes are often used and lack originality.

- Option 4: Vague, subjective statements

- This refers to unclear and opinion-based statements, but doesn't highlight overuse.