Answer:
1) a
2) a
3) a
4) b
5) c
6) a
Step-by-step explanation:
The reason why "Eloise lives in a big house" is the right choice is because it is a single independent clause, with a single subject (Eloise) and a single predicate (lives in a big house).
Then, with respect to the other questions, it can be said that the answers chosen have overt NP subjects, except for 3. Neither of them contains a compound subject sharing the same predicate, nor a D.O shared by two verbs (clean and dry dishes). In this way, all of the options represent two sentences that have been joined by a conjunction.