6257. I realised they wanted to be alone together, so I felt very awkward.

✅ The correct answer is option C.
Cumbersome : large or heavy and therefore difficult to carry or use; unwieldy.

Unwieldy : (of an object) difficult to move because of its size, shape, or weight.

Embarrassed : feeling or showing embarrassment.

Clumsy : difficult to handle or use; unwieldy.

Awkward : causing or feeling uneasy embarrassment or inconvenience.

Synonym of Awkward is Embarrassed