The meter from this line is pentameter, and to be more precise, this is an iambic pentameter.
Iambic means that the first syllable in the line is unstressed, and that it is followed by a stressed one. Here, you can see that DO in the beginning is unstressed, and the accent is placed on the second syllable, NOT. Pentameter means that there are five meters (penta means 5), and given that one meter consists of 2 syllables approximately, pentameter consists of 10 syllables in each line.
Tele is defined as from a long distance
I think it is A. was waving at the flag. This is just my opinion is I may be wrong. Please feel free to correct me in the comments. Have a nice day!
The answer is B because we need to know what's happening to kids after lunch, and see how they can stand awake.