The correct answer is: Only assumption I is implicit.
The statement “If Rajan has finished reading the instructions, then let him begin the activities accordingly” implies that Rajan has understood the instructions. This is because if Rajan has not understood the instructions, then he will not be able to begin the activities accordingly.
However, the statement does not imply that Rajan is capable of performing the activities. This is because it is possible for someone to understand instructions but not be capable of performing the activities. For example, someone might understand the instructions for how to play a musical instrument but not be able to play the instrument well.
Therefore, only assumption I is implicit in the statement.