The tablet that contains the most iron contains the least zinc.
- Z contains most Iron (45 as compared to 17 and 20), but it has 15 Zinc (which is not the least as X has least Zinc vale of 14)
- So, DOES NOT Apply

The tablet with the most total iron, calcium, and zinc combined is Tablet Z.
- Tablet X Total = 17+40+14 = 71
- Tablet Y Total = 20+25+20 = 65
- Tablet Z Total = 45+20+15 = 80
- So, It Applies

The tablet with the most calcium has less iron and less zinc than both of the other tablets.
- X has most calcium (40 as compared to 25 and 20) and it has less iron (17 as compared to 20 and 45) and zinc (14 as compared to 20 and 15) than both of the other tablets
- So, It Applies

By taking three of each tablet, a person will consume between 140 and 250 mg of all three elements.
- Three of each will give total iron as 3*(17+20+45) = 246mg
- Three of each will give total calcium as 3*(40+25+20) = 255mg (NOT between 140 and 250mg)
- Three of each will give total zinc as 3*(14+20+15) = 147 mg
- So, DOES NOT Apply

So, only 2nd and 3rd one are true. (or B and C)
Hope it helps!