Over the course of time says its an ongoing activity. Ie. Has developed. Had developed is past perfect used when followed by another past activity. Here no other later past activity is mentioned so present perfect is good to use.it boils it down to B,E.
Sense of articulate speech is singular. So, E.
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Sense of articulate speech is singular. So, E.
Sent from my CP8676_I02 using GMAT Club Forum mobile app
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