There are many satellites for the purpose states in the underlined segment of the sentence. AM-1 is one of these sentences.
While, generally, each, one of the many, every one sends an alert about retaining singular verb forms, it is also important to understand the sentence. In the sentence provided, the underlines statement is not about AM-1 but about the many satellites. Hence, "are" fits in rather than "is".
This helps eliminate the options A,B and C.
Option D casts doubt
...
While, generally, each, one of the many, every one sends an alert about retaining singular verb forms, it is also important to understand the sentence. In the sentence provided, the underlines statement is not about AM-1 but about the many satellites. Hence, "are" fits in rather than "is".
This helps eliminate the options A,B and C.
Option D casts doubt
...
