Question

Which sentence is punctuated correctly?

a. "How can you tell poison ivy from other plants," he asked?
b. Shaking his head, Tony exclaimed, "It's hopeless!"
c. Sam said, "Poison ivy always has three leaves".
d. "Yes." Nan agreed, "that is your most important clue."

Answer 1

b. Shaking his head, Tony exclaimed, "It's hopeless!"

There should be a period instead of a question mark in A.
The period should be inside the quotation marks of C.
There should be a comma after that yes, but inside the quotation marks, of D.