Answer:
The answer to your question is b. Strontium
Step-by-step explanation:
Elements that are placed in the same group in the Periodic Table have similar properties.
Magnesium is located in the second group so, elements of this group have similar properties to magnesium.
a. Sodium is located in group I, this is not the answer
b. Strontium is located in group II, this is the correct option.
c. Boron is located in group III, this option is incorrect.
d. Chlorine is located in group VII, this option is incorrect.
e. Carbon is located in group IV, this is not the right answer.