Ooh, this is a tricky little thing that e-GMAT is testing here. Nice question!
VyshakhR1995's explanation is spot-on. If you like grammar terminology, you could also think of it this way: when "each" is used as a pronoun, it's alwayssingular:
But "each" can also be an adverb:
...
VyshakhR1995's explanation is spot-on. If you like grammar terminology, you could also think of it this way: when "each" is used as a pronoun, it's alwayssingular:
- Each of my dogs eats four pounds of Alpo daily.
But "each" can also be an adverb:
- My dogs eat four pounds of Alpo each. --> "each" is just an adverb, modifying "eat"
My dogs each eat four pounds of Alpo. --> "each"
...
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