Which word in Group B can be added to Group A? Why?

Group A: forty, grape, react, rouge
Group B: carat, claim, coast, crass, curse

Per this rebus, what is indicated by item #5?

1) . echo
2) . feedback
3) . reflect
4) . reply
5) .

The sign at the restaurant read "No shirt, no shoes, no service". Wally put on a shirt and a pair of shoes, tried to enter without pants and socks, but he was still turned away. Apparently, he had to be fully dressed. Help Wally get dressed, starting with his shirt, then his pants, followed by his socks, and finally his shoes. Change SHIRT to SHOES by changing one letter at a time. The change must go through PANTS and SOCKS. Each change must ...

As I get closer, my tail grows longer;
As I leave, my tail leads the way.

What am I?

Make GAR (fish) evolve into DOG (mammal) by changing one letter at a time. Each change must produce a valid word in the English language. But there is a catch. The evolution must go through BOA (reptile) and OWL (bird). No word can be used more than once.

GAR ---- BOA ---- OWL ---- DOG

Which word in Group B can be added to Group A? Why?

Group A: comb, mount, strophe, tonic
Group B: acre, floor, giant, log, redo, view