Select the best answer from the choices below. What causes resonance? a. Destructive interference
b .Two nearby objects vibrating at the same frequency
c. A wave passing from one medium to another
d. Constructive interference

The match between the vibrations of the air column and one of the natural frequencies of the singing rod causes resonance. So ITS A  

Two nearby objects vibrating at the same frequency

Explanation:

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6