Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select No substitution required.Last month, scientists are posting the latest pictures of Mars taken by the Mangalyaan.

Select the most appropriate option to substitute the underlined segmen

1.	Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select No substitution required.Last month, scientists are posting the latest pictures of Mars taken by the Mangalyaan.
A.	No substitution required
B.	posted
C.	have been posting
D.	will be posting
Answer» C. have been posting