The correct option is
D to pay
In order to fill in the blank with the most suitable verb, we need to understand the usage of 'make'. 'Make' means to force someone to do something. If 'make' is used in a passive (voice) sentence, we use the word 'to' along with the verb. In an active sentence, we do not use 'to' with the verb. The verbs without the marker 'to', are called bare infinitives.As the given sentence is in the passive voice, we will not use the bare infinitive here; we will use the verb with the marker 'to'.
Option A - 'To paid' can't be used here as the verb with to has to be in its original form. As the given verb 'paid' is the past form of the verb 'pay', it's a wrong choice. Hence, option A is incorrect.
Option B - 'Paid' is the past form of the verb 'pay'. As explained above we need the infinitive with the marker 'to', we can't use 'paid' here. Hence, option B is incorrect.
Option C - 'Pay' is a verb in its original form, but it isn't accompanied by the marker 'to'. Hence, option C is incorrect.
Option D - 'To pay' can be used here, as the verb with the marker 'to' is in its original form and can be used in case of a sentence in passive voice. Hence, option D is the correct answer.
'As Raj had borrowed money from Suresh, he was made to pay it back in installments.'