24.
Your Answer is
Correct Answer is G
Explanation
Item F/J: The underlined part is the position of the predicate verb, and its subject is tending to the hungry birds, and an attributive clause is inserted between the subject and the predicate, so a comma is required before is, item F/J mistake.
Item H: while is like running a boarding house, there is no punctuation between the verb and the object, and item H is wrong.