Which sentence contains a contraction that is formed incorrectly? A. Theres a red gate at the park's entrance. B. Let's go to the movies if you're available later. C. I'd love to hear another of Lisa's ideas. D. Joelle and Jim's mother isn't feeling well today. help please
Actually, the isn't refers only to the mother so it is correct.
the incorrect form is THERES, it should have an apostrophe: THERE'S
everything else is correct.