The most useful property of metalloids is their (A) Varying ability to conduct electric current.
(B) Softness and malleability.
(C) Tendency to be unreactive.
(D) Ability to be pulled out into long wires.

(A) Varying ability to conduct electric current.

Explanation:

The most useful property of metalloids is their varying ability to conduct electric current.

Metalloids are elements or substances that shares properties that transcends between those of a true metal and non-metal.

i'm assuming that the correct answer is indeed the first one/ "a"..

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.