Incorrect Evaluation - Marking Correct Answers as Incorrect - Week 2 Quiz

Even though I have selected the correct answers for the Week 2 quiz, it was evaluated
as incorrect. Ironically, I have selected all the four answers by retaking the quiz continuously
But it was considered as wrong answers (all the four choices). This happens for
some four to five questions.

Multiple answers might be correct for some questions. Please check for instructions in each question before answering.