2. is the distance and direction of an object’s change in position from the starting a. speed b. displacement c. velocity d. rate

Displacement is the distance and direction of an object's change in position from the starting.
Hence option B is correct.

Hope this helps!

The answer for this is a

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.