I am pretty sure it is option "A."
Diligence by definition means to "careful and persistent work or effort"
So yeah the answer is A.
Hope this helped-- <span />
A colon because it's formal.
Because they were surprised that it preserved so well in such a long period of time.
The student writing this wrote very informally and inappropriately. Words such as “ya,” and “IMHO” are not appropriate for an email to a professor.
Hope this helped..
Answer:
some biggest challenges are
i) i need to control myself from wasting money on unimportant things .
ii) i have to use public transport often .
ii) i have to also face problem regarding my extra expenses such as dress , food and should buy how much i need .