domestication camel....(how the ansd is cumin)

[kalyand022]

The domesticated camel, which some scholars date around the twelfth century B.C., was the key to the development of the spice trade in the ancient world.

a. The domesticated camel, which some scholars date
b. The domesticated camel, which some scholars have thought to occur
c. Domesticating the camel, dated by some scholars at
d. The domestication of the camel, thought by some scholars to have occurred
e. The camel's domestication, dated by some scholars to have been

Ans is given D...

How cum ans should be E......

Please explain these

[logitech]

The domesticated camel, which some scholars date around the twelfth century B.C., was the key to the development of the spice trade in the ancient world.

a. The domesticated camel, which some scholars date
b. The domesticated camel, which some scholars have thought to occur
c. Domesticating the camel, dated by some scholars at
d. The domestication of the camel, thought by some scholars to have occurred
e. The camel's domestication, dated by some scholars to have been

Ans is given D...

How cum ans should be E......

Please explain these

NOUN + BE-VERB + NOUN/ADJECTIVE

Two sides of the Be verb must be parallel. There is a page about this topic in MGMAT SC guide.

In option E:

The camel's domestication, dated by some scholars to have been around the twelfth century B.C., was the key to the development of the spice trade in the ancient world.

Erin also explained this concept in the link below:

https://www.urch.com/forums/gmat-sentenc ... -date.html