Arduous means<u>: involving or requiring strenuous effort; difficult and tiring</u>
Hope this helps have a great day:)
Um well if you was more clear on the question and told use all the information we could tell you cause we can’t with out the other information
I believe its C <span>C)In the summer of 1927, President Calvin Coolidge participated in the formal dedication of the massive stone monument known as mount Rushmore, which was completed 14 years later." </span>
