Maybe efficient, you didn't put the passage
number 1 is A, and number 2 is A also
The correct subject-verb agreement from the answer choices below is A)is...has.
'A cake or brownies is the easiest to serve. My mom has agreed to bake this weekend.'
That sounds better than
'A cake or brownies are the easiest to serve. My mom have agreed to bake this weekend.'
'A cake or brownies is the easiest to serve. My mom have agreed to bake this weekend.'
'A cake or brownies are the easiest to serve. My mom has agreed to bake this weekend.'
Those don't make sense when you read them, hence why A) is the correct choice.
Answer: Arguing their case, the prosecutors made several valid points.
Explanation: I hope this helps you