C. food (All other options relate to actions or concepts associated with help or support.)

B. street (The other options are parts of a building or something that can be cleaned.)

B. educate (The other options are things or items related to donations or aid.)

D. waste (The other options are related to donation or giving.)

C. people (The other options describe specific groups or conditions of people.)

A. volunteer (The other options are items that can be donated.)

D. school (The other options are related to forms of assistance or activities.)

B. essential (The other options relate to types of services or aspects related to service.)

B. homework (The other options are related to education or support in learning.)

D. orphan (The other options refer to older individuals or related institutions.)