B. I hate peanut butter because it sticks in my mouth and glues my jaws together. underlined words are sticks and glues
Grass and turf are synonyms in the first sentence. The turf is a most specific word for the grass that is found on athletic fields. In sentence B, glues and sticks are synonyms and glues more specifically tells you what the peanut butter is doing.
D. We were shocked and amazed to find that the rock we found was an uncut diamond. underlined words are shocked and amazed
Shocked and amazed are also synonyms and can be interchangeable just like the words sticks, glues and grass, turf.
Sentence C would not work because hard and easy are antonymns. Sentence A does not work because best and next are not related.