Namsan Tower: Questions and Answers

Hello! Everyone, it's nice to be back again! In this post, I want to make 5 Q&A from my latest experience post, the place that I really want to visit in the future. Well, yeah, hope things went well. Here it is!

Source: Wikipedia

1. When is the completion of The N Seoul Tower's construction? 
    The N Seoul Tower's construction' completion is in...
    a. 1975
    b. 1976
    c. 1977
    d. 1980
    e. 1977-1978

2. In 2005, Namsan Tower has its name changed into N Seoul Tower which "N" stands for...
    a. Namsan, Nature, New
    b. Nails, Nature, Noon
    c. New, Namsan, Night
    d. New, Null, Night
    e. Noon, Near, Nature

3. This is the function of N Seoul Tower, except...
    a. Tourist attraction
    b. General radio wave tower
    c. Soccer Stadium
    d. Tourist attraction 
    e. Worldwide travel expert

4. When is the observatory of N Seoul Tower was closed to the public?
    a. December 3, 1971
    b. December 4, 1971
    c. October 16, 1980
    d. October 15, 1980
    e. September 11, 1980

5. Why is the writer think that N Seoul Tower is an unique place?
    a. N Seoul Tower spent so much KRW on renovating it.
    b. N Seoul Tower had so many unique and different rooms inside.
    c. N Seoul Tower is a Korea's first general radio wave tower that holds transmissions antennas.
    d. N Seoul Tower is a tourists favorite attractions.
    e. N Seoul Tower is a city landmark.

P. S. The answers is the one which is bolded.
         
So, that's the 5 Q&A I could make about... thank you!