An agreement question tests whether a verb matches its subject in a clause starting with that. First find the noun the clause describes, then check with it or they. In the present tense, it takes the -s form and they the base form; has goes with it, and have goes with they. An -ing form needs a helping verb to serve as the clause's main verb. Test each form against the subject and the clause.
Hints
- Hint 1
Look at the part of the sentence beginning with that. Does that part have its own main verb yet?
- Hint 2
Ask what that stands for, then decide whether that noun means one thing or more than one.
Step-by-step
Find the clause's true subject
Step 1Sort the forms and check the clause
Sort the verb forms: transmit and have transmitted work with they, so they're plural. Transmitting can't be a main verb on its own. Does that ______ its location need its own main verb? Yes: a clause, a group of words with its own subject and verb, needs its own main verb; the earlier is equipped belongs to the scooter.
- Step 2
Find what the clause describes
Which noun does that stand for? In this sentence, the clause describes a small GPS unit, so its verb must match that noun. The unit sends its own location to the servers; the servers receive it, so they aren't the subject here. One GPS unit is singular, which means we can replace the subject with it.
- Step 3
Match the singular form
Replace a small GPS unit with it: we say it transmits its location. The singular form transmits has the -s ending that goes with one unit in the present tense, so it completes the clause. Choice B.