Directions : Each of the following sentences in this section has a blank space with four options. Select whichever preposition or determiner you consider the most appropriate for the blank space and indicate your response accordingly.
System performance was demonstrated _____________ the Drop Zone from an altitude of 5000 m.

Question

Directions : Each of the following sentences in this section has a blank space with four options. Select whichever preposition or determiner you consider the most appropriate for the blank space and indicate your response accordingly.

System performance was demonstrated _____________ the Drop Zone from an altitude of 5000 m.

Accepted Answer

Option B: at