Which sentence does NOT contain an error in pronoun-antecedent agreement?
1)One of these plants has an unusual pattern on their leaves,
2)Early astronomers had to use their eyes alone to study the stars.
3)An ancient Greek astronomer used their tools to predict positions of the sun.

3

Explanation:

"their" is referring to (typically) a singular person speaking from your perspecive

so saying it like three does sounds improper, and is therefore incorrect grammar.

ex: "it was their choice." I said.

i'm pretty sure it is 1) wants to hide her true feelings about robert. i'm sorry if it is wrong. good luck! : d

c, his tragic flaw to cause his downfall