Answer is a) a
Reason. Milk is a drink for children.
It’s not “an” drink for children or “the” drink for children. Unless there is an article somewhere you didn’t post I don’t know what d) no article means.
6. 0.2 on the second line of the number line before 1 and 1/5 as a fraction
7. 0.9 on the last line before 1 of the number line and 9/10 as a fraction
8. 0.3 on the third line of the number line before 1 and 3/10 as a fraction
9. 0.7 on the seventh line of the number line before 1 and 7/10 as a fraction
10. 1.0 on number 1 and 1/1 or 10/10
Sorry if it’s confusing but I hope it helps :)
Plethora would be the collective noun because it is a group.