Identify the missing figure in the following series.

The triangle is moving in clockwise direction so the missing figure must be facing downwards.

the orientation of cross and circle inside is changing alternatively.

for the first figure circle is at the T head and cross is at it's tail, for the second figure cross is at the T head and circle at the tail hence for the third figure circle will be at the T head and cross at the T tail.

therefore option A is the right answer.