In English if a word begins with a [l] or [r] then the next sound must be a ______.

A．are not necessarily produced as a result of governmental support for military weapons research and development
B．came primarily from the huge laboratories of monopoly industries
C．were produced at least as frequently by independent inventors as by research teams
D．have greater impact on smaller firms than on conglomerates

A．monopoly power creates an environment supportive of innovation
B．governmental protection for military research will do much to protect our dwindling resources
C．industrial giants, with their managerial bureaucracies, respond more quickly to technological change
D．firms with a small share of the market will aggressively pursue innovations because they are not locked into old capital equipment