Please help me with Part B and Part C!

B.

No light

C.

Explanation:

B. Maximum in A, Minimum in B

When a colored filter is placed in the path of white light, the light passes through the filter, is of the same color as that of filter.

So, when the white light passes through the red filter, the red light pass through it.

When red light pass through the green filter, the light passes through the green filter is none, so this is dark.

C.

When the nail is placed in ordinary water, it gets rusted due to the oxygen present in water.

When nail is placed in boiling water which is covered with oil, so the rust is very small quantity as boiling water also contains some oxygen.

When the nail is placed in calcium carbonate, it absorb all the moisture of air and no rusting takes place.

So, maximum rusting in test tube A and minimum rusting is in test tube C.  

catya your not at all which answer i've seen you do this on another question!

answer///carbon;