Answer to Question 1
Answer: B
Explanation: B) Only a person can stall for two days, not an assignment, so the modifying phrase, Having stalled for two days, does not modify the subject of the sentence, the assignment. Therefore, this sentence contains a dangling modifier.
Answer to Question 2
Answer: A
Explanation: A) Parallel items work only if they are of the same phrase type. To waste time is an infinitive phrase, while missing deadlines is a gerund phrase. As two different phrase types, these phrases should not be placed in a parallel construction.